core.c revision d8493d210b69b2965236a8a02f5f6e2835ad5e30
1/* 2 * core.c -- Voltage/Current Regulator framework. 3 * 4 * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5 * Copyright 2008 SlimLogic Ltd. 6 * 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 */ 15 16#include <linux/kernel.h> 17#include <linux/init.h> 18#include <linux/debugfs.h> 19#include <linux/device.h> 20#include <linux/slab.h> 21#include <linux/async.h> 22#include <linux/err.h> 23#include <linux/mutex.h> 24#include <linux/suspend.h> 25#include <linux/delay.h> 26#include <linux/of.h> 27#include <linux/regmap.h> 28#include <linux/regulator/of_regulator.h> 29#include <linux/regulator/consumer.h> 30#include <linux/regulator/driver.h> 31#include <linux/regulator/machine.h> 32#include <linux/module.h> 33 34#define CREATE_TRACE_POINTS 35#include <trace/events/regulator.h> 36 37#include "dummy.h" 38 39#define rdev_crit(rdev, fmt, ...) \ 40 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 41#define rdev_err(rdev, fmt, ...) \ 42 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 43#define rdev_warn(rdev, fmt, ...) \ 44 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 45#define rdev_info(rdev, fmt, ...) \ 46 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 47#define rdev_dbg(rdev, fmt, ...) \ 48 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 49 50static DEFINE_MUTEX(regulator_list_mutex); 51static LIST_HEAD(regulator_list); 52static LIST_HEAD(regulator_map_list); 53static bool has_full_constraints; 54static bool board_wants_dummy_regulator; 55 56static struct dentry *debugfs_root; 57 58/* 59 * struct regulator_map 60 * 61 * Used to provide symbolic supply names to devices. 62 */ 63struct regulator_map { 64 struct list_head list; 65 const char *dev_name; /* The dev_name() for the consumer */ 66 const char *supply; 67 struct regulator_dev *regulator; 68}; 69 70/* 71 * struct regulator 72 * 73 * One for each consumer device. 74 */ 75struct regulator { 76 struct device *dev; 77 struct list_head list; 78 unsigned int always_on:1; 79 int uA_load; 80 int min_uV; 81 int max_uV; 82 char *supply_name; 83 struct device_attribute dev_attr; 84 struct regulator_dev *rdev; 85 struct dentry *debugfs; 86}; 87 88static int _regulator_is_enabled(struct regulator_dev *rdev); 89static int _regulator_disable(struct regulator_dev *rdev); 90static int _regulator_get_voltage(struct regulator_dev *rdev); 91static int _regulator_get_current_limit(struct regulator_dev *rdev); 92static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 93static void _notifier_call_chain(struct regulator_dev *rdev, 94 unsigned long event, void *data); 95static int _regulator_do_set_voltage(struct regulator_dev *rdev, 96 int min_uV, int max_uV); 97static struct regulator *create_regulator(struct regulator_dev *rdev, 98 struct device *dev, 99 const char *supply_name); 100 101static const char *rdev_get_name(struct regulator_dev *rdev) 102{ 103 if (rdev->constraints && rdev->constraints->name) 104 return rdev->constraints->name; 105 else if (rdev->desc->name) 106 return rdev->desc->name; 107 else 108 return ""; 109} 110 111/* gets the regulator for a given consumer device */ 112static struct regulator *get_device_regulator(struct device *dev) 113{ 114 struct regulator *regulator = NULL; 115 struct regulator_dev *rdev; 116 117 mutex_lock(®ulator_list_mutex); 118 list_for_each_entry(rdev, ®ulator_list, list) { 119 mutex_lock(&rdev->mutex); 120 list_for_each_entry(regulator, &rdev->consumer_list, list) { 121 if (regulator->dev == dev) { 122 mutex_unlock(&rdev->mutex); 123 mutex_unlock(®ulator_list_mutex); 124 return regulator; 125 } 126 } 127 mutex_unlock(&rdev->mutex); 128 } 129 mutex_unlock(®ulator_list_mutex); 130 return NULL; 131} 132 133/** 134 * of_get_regulator - get a regulator device node based on supply name 135 * @dev: Device pointer for the consumer (of regulator) device 136 * @supply: regulator supply name 137 * 138 * Extract the regulator device node corresponding to the supply name. 139 * retruns the device node corresponding to the regulator if found, else 140 * returns NULL. 141 */ 142static struct device_node *of_get_regulator(struct device *dev, const char *supply) 143{ 144 struct device_node *regnode = NULL; 145 char prop_name[32]; /* 32 is max size of property name */ 146 147 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 148 149 snprintf(prop_name, 32, "%s-supply", supply); 150 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 151 152 if (!regnode) { 153 dev_dbg(dev, "Looking up %s property in node %s failed", 154 prop_name, dev->of_node->full_name); 155 return NULL; 156 } 157 return regnode; 158} 159 160static int _regulator_can_change_status(struct regulator_dev *rdev) 161{ 162 if (!rdev->constraints) 163 return 0; 164 165 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 166 return 1; 167 else 168 return 0; 169} 170 171/* Platform voltage constraint check */ 172static int regulator_check_voltage(struct regulator_dev *rdev, 173 int *min_uV, int *max_uV) 174{ 175 BUG_ON(*min_uV > *max_uV); 176 177 if (!rdev->constraints) { 178 rdev_err(rdev, "no constraints\n"); 179 return -ENODEV; 180 } 181 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 182 rdev_err(rdev, "operation not allowed\n"); 183 return -EPERM; 184 } 185 186 if (*max_uV > rdev->constraints->max_uV) 187 *max_uV = rdev->constraints->max_uV; 188 if (*min_uV < rdev->constraints->min_uV) 189 *min_uV = rdev->constraints->min_uV; 190 191 if (*min_uV > *max_uV) { 192 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 193 *min_uV, *max_uV); 194 return -EINVAL; 195 } 196 197 return 0; 198} 199 200/* Make sure we select a voltage that suits the needs of all 201 * regulator consumers 202 */ 203static int regulator_check_consumers(struct regulator_dev *rdev, 204 int *min_uV, int *max_uV) 205{ 206 struct regulator *regulator; 207 208 list_for_each_entry(regulator, &rdev->consumer_list, list) { 209 /* 210 * Assume consumers that didn't say anything are OK 211 * with anything in the constraint range. 212 */ 213 if (!regulator->min_uV && !regulator->max_uV) 214 continue; 215 216 if (*max_uV > regulator->max_uV) 217 *max_uV = regulator->max_uV; 218 if (*min_uV < regulator->min_uV) 219 *min_uV = regulator->min_uV; 220 } 221 222 if (*min_uV > *max_uV) 223 return -EINVAL; 224 225 return 0; 226} 227 228/* current constraint check */ 229static int regulator_check_current_limit(struct regulator_dev *rdev, 230 int *min_uA, int *max_uA) 231{ 232 BUG_ON(*min_uA > *max_uA); 233 234 if (!rdev->constraints) { 235 rdev_err(rdev, "no constraints\n"); 236 return -ENODEV; 237 } 238 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 239 rdev_err(rdev, "operation not allowed\n"); 240 return -EPERM; 241 } 242 243 if (*max_uA > rdev->constraints->max_uA) 244 *max_uA = rdev->constraints->max_uA; 245 if (*min_uA < rdev->constraints->min_uA) 246 *min_uA = rdev->constraints->min_uA; 247 248 if (*min_uA > *max_uA) { 249 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 250 *min_uA, *max_uA); 251 return -EINVAL; 252 } 253 254 return 0; 255} 256 257/* operating mode constraint check */ 258static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 259{ 260 switch (*mode) { 261 case REGULATOR_MODE_FAST: 262 case REGULATOR_MODE_NORMAL: 263 case REGULATOR_MODE_IDLE: 264 case REGULATOR_MODE_STANDBY: 265 break; 266 default: 267 rdev_err(rdev, "invalid mode %x specified\n", *mode); 268 return -EINVAL; 269 } 270 271 if (!rdev->constraints) { 272 rdev_err(rdev, "no constraints\n"); 273 return -ENODEV; 274 } 275 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 276 rdev_err(rdev, "operation not allowed\n"); 277 return -EPERM; 278 } 279 280 /* The modes are bitmasks, the most power hungry modes having 281 * the lowest values. If the requested mode isn't supported 282 * try higher modes. */ 283 while (*mode) { 284 if (rdev->constraints->valid_modes_mask & *mode) 285 return 0; 286 *mode /= 2; 287 } 288 289 return -EINVAL; 290} 291 292/* dynamic regulator mode switching constraint check */ 293static int regulator_check_drms(struct regulator_dev *rdev) 294{ 295 if (!rdev->constraints) { 296 rdev_err(rdev, "no constraints\n"); 297 return -ENODEV; 298 } 299 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 300 rdev_err(rdev, "operation not allowed\n"); 301 return -EPERM; 302 } 303 return 0; 304} 305 306static ssize_t device_requested_uA_show(struct device *dev, 307 struct device_attribute *attr, char *buf) 308{ 309 struct regulator *regulator; 310 311 regulator = get_device_regulator(dev); 312 if (regulator == NULL) 313 return 0; 314 315 return sprintf(buf, "%d\n", regulator->uA_load); 316} 317 318static ssize_t regulator_uV_show(struct device *dev, 319 struct device_attribute *attr, char *buf) 320{ 321 struct regulator_dev *rdev = dev_get_drvdata(dev); 322 ssize_t ret; 323 324 mutex_lock(&rdev->mutex); 325 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 326 mutex_unlock(&rdev->mutex); 327 328 return ret; 329} 330static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 331 332static ssize_t regulator_uA_show(struct device *dev, 333 struct device_attribute *attr, char *buf) 334{ 335 struct regulator_dev *rdev = dev_get_drvdata(dev); 336 337 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 338} 339static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 340 341static ssize_t regulator_name_show(struct device *dev, 342 struct device_attribute *attr, char *buf) 343{ 344 struct regulator_dev *rdev = dev_get_drvdata(dev); 345 346 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 347} 348 349static ssize_t regulator_print_opmode(char *buf, int mode) 350{ 351 switch (mode) { 352 case REGULATOR_MODE_FAST: 353 return sprintf(buf, "fast\n"); 354 case REGULATOR_MODE_NORMAL: 355 return sprintf(buf, "normal\n"); 356 case REGULATOR_MODE_IDLE: 357 return sprintf(buf, "idle\n"); 358 case REGULATOR_MODE_STANDBY: 359 return sprintf(buf, "standby\n"); 360 } 361 return sprintf(buf, "unknown\n"); 362} 363 364static ssize_t regulator_opmode_show(struct device *dev, 365 struct device_attribute *attr, char *buf) 366{ 367 struct regulator_dev *rdev = dev_get_drvdata(dev); 368 369 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 370} 371static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 372 373static ssize_t regulator_print_state(char *buf, int state) 374{ 375 if (state > 0) 376 return sprintf(buf, "enabled\n"); 377 else if (state == 0) 378 return sprintf(buf, "disabled\n"); 379 else 380 return sprintf(buf, "unknown\n"); 381} 382 383static ssize_t regulator_state_show(struct device *dev, 384 struct device_attribute *attr, char *buf) 385{ 386 struct regulator_dev *rdev = dev_get_drvdata(dev); 387 ssize_t ret; 388 389 mutex_lock(&rdev->mutex); 390 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 391 mutex_unlock(&rdev->mutex); 392 393 return ret; 394} 395static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 396 397static ssize_t regulator_status_show(struct device *dev, 398 struct device_attribute *attr, char *buf) 399{ 400 struct regulator_dev *rdev = dev_get_drvdata(dev); 401 int status; 402 char *label; 403 404 status = rdev->desc->ops->get_status(rdev); 405 if (status < 0) 406 return status; 407 408 switch (status) { 409 case REGULATOR_STATUS_OFF: 410 label = "off"; 411 break; 412 case REGULATOR_STATUS_ON: 413 label = "on"; 414 break; 415 case REGULATOR_STATUS_ERROR: 416 label = "error"; 417 break; 418 case REGULATOR_STATUS_FAST: 419 label = "fast"; 420 break; 421 case REGULATOR_STATUS_NORMAL: 422 label = "normal"; 423 break; 424 case REGULATOR_STATUS_IDLE: 425 label = "idle"; 426 break; 427 case REGULATOR_STATUS_STANDBY: 428 label = "standby"; 429 break; 430 default: 431 return -ERANGE; 432 } 433 434 return sprintf(buf, "%s\n", label); 435} 436static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 437 438static ssize_t regulator_min_uA_show(struct device *dev, 439 struct device_attribute *attr, char *buf) 440{ 441 struct regulator_dev *rdev = dev_get_drvdata(dev); 442 443 if (!rdev->constraints) 444 return sprintf(buf, "constraint not defined\n"); 445 446 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 447} 448static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 449 450static ssize_t regulator_max_uA_show(struct device *dev, 451 struct device_attribute *attr, char *buf) 452{ 453 struct regulator_dev *rdev = dev_get_drvdata(dev); 454 455 if (!rdev->constraints) 456 return sprintf(buf, "constraint not defined\n"); 457 458 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 459} 460static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 461 462static ssize_t regulator_min_uV_show(struct device *dev, 463 struct device_attribute *attr, char *buf) 464{ 465 struct regulator_dev *rdev = dev_get_drvdata(dev); 466 467 if (!rdev->constraints) 468 return sprintf(buf, "constraint not defined\n"); 469 470 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 471} 472static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 473 474static ssize_t regulator_max_uV_show(struct device *dev, 475 struct device_attribute *attr, char *buf) 476{ 477 struct regulator_dev *rdev = dev_get_drvdata(dev); 478 479 if (!rdev->constraints) 480 return sprintf(buf, "constraint not defined\n"); 481 482 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 483} 484static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 485 486static ssize_t regulator_total_uA_show(struct device *dev, 487 struct device_attribute *attr, char *buf) 488{ 489 struct regulator_dev *rdev = dev_get_drvdata(dev); 490 struct regulator *regulator; 491 int uA = 0; 492 493 mutex_lock(&rdev->mutex); 494 list_for_each_entry(regulator, &rdev->consumer_list, list) 495 uA += regulator->uA_load; 496 mutex_unlock(&rdev->mutex); 497 return sprintf(buf, "%d\n", uA); 498} 499static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 500 501static ssize_t regulator_num_users_show(struct device *dev, 502 struct device_attribute *attr, char *buf) 503{ 504 struct regulator_dev *rdev = dev_get_drvdata(dev); 505 return sprintf(buf, "%d\n", rdev->use_count); 506} 507 508static ssize_t regulator_type_show(struct device *dev, 509 struct device_attribute *attr, char *buf) 510{ 511 struct regulator_dev *rdev = dev_get_drvdata(dev); 512 513 switch (rdev->desc->type) { 514 case REGULATOR_VOLTAGE: 515 return sprintf(buf, "voltage\n"); 516 case REGULATOR_CURRENT: 517 return sprintf(buf, "current\n"); 518 } 519 return sprintf(buf, "unknown\n"); 520} 521 522static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 523 struct device_attribute *attr, char *buf) 524{ 525 struct regulator_dev *rdev = dev_get_drvdata(dev); 526 527 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 528} 529static DEVICE_ATTR(suspend_mem_microvolts, 0444, 530 regulator_suspend_mem_uV_show, NULL); 531 532static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 533 struct device_attribute *attr, char *buf) 534{ 535 struct regulator_dev *rdev = dev_get_drvdata(dev); 536 537 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 538} 539static DEVICE_ATTR(suspend_disk_microvolts, 0444, 540 regulator_suspend_disk_uV_show, NULL); 541 542static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 543 struct device_attribute *attr, char *buf) 544{ 545 struct regulator_dev *rdev = dev_get_drvdata(dev); 546 547 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 548} 549static DEVICE_ATTR(suspend_standby_microvolts, 0444, 550 regulator_suspend_standby_uV_show, NULL); 551 552static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 553 struct device_attribute *attr, char *buf) 554{ 555 struct regulator_dev *rdev = dev_get_drvdata(dev); 556 557 return regulator_print_opmode(buf, 558 rdev->constraints->state_mem.mode); 559} 560static DEVICE_ATTR(suspend_mem_mode, 0444, 561 regulator_suspend_mem_mode_show, NULL); 562 563static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 564 struct device_attribute *attr, char *buf) 565{ 566 struct regulator_dev *rdev = dev_get_drvdata(dev); 567 568 return regulator_print_opmode(buf, 569 rdev->constraints->state_disk.mode); 570} 571static DEVICE_ATTR(suspend_disk_mode, 0444, 572 regulator_suspend_disk_mode_show, NULL); 573 574static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 575 struct device_attribute *attr, char *buf) 576{ 577 struct regulator_dev *rdev = dev_get_drvdata(dev); 578 579 return regulator_print_opmode(buf, 580 rdev->constraints->state_standby.mode); 581} 582static DEVICE_ATTR(suspend_standby_mode, 0444, 583 regulator_suspend_standby_mode_show, NULL); 584 585static ssize_t regulator_suspend_mem_state_show(struct device *dev, 586 struct device_attribute *attr, char *buf) 587{ 588 struct regulator_dev *rdev = dev_get_drvdata(dev); 589 590 return regulator_print_state(buf, 591 rdev->constraints->state_mem.enabled); 592} 593static DEVICE_ATTR(suspend_mem_state, 0444, 594 regulator_suspend_mem_state_show, NULL); 595 596static ssize_t regulator_suspend_disk_state_show(struct device *dev, 597 struct device_attribute *attr, char *buf) 598{ 599 struct regulator_dev *rdev = dev_get_drvdata(dev); 600 601 return regulator_print_state(buf, 602 rdev->constraints->state_disk.enabled); 603} 604static DEVICE_ATTR(suspend_disk_state, 0444, 605 regulator_suspend_disk_state_show, NULL); 606 607static ssize_t regulator_suspend_standby_state_show(struct device *dev, 608 struct device_attribute *attr, char *buf) 609{ 610 struct regulator_dev *rdev = dev_get_drvdata(dev); 611 612 return regulator_print_state(buf, 613 rdev->constraints->state_standby.enabled); 614} 615static DEVICE_ATTR(suspend_standby_state, 0444, 616 regulator_suspend_standby_state_show, NULL); 617 618 619/* 620 * These are the only attributes are present for all regulators. 621 * Other attributes are a function of regulator functionality. 622 */ 623static struct device_attribute regulator_dev_attrs[] = { 624 __ATTR(name, 0444, regulator_name_show, NULL), 625 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 626 __ATTR(type, 0444, regulator_type_show, NULL), 627 __ATTR_NULL, 628}; 629 630static void regulator_dev_release(struct device *dev) 631{ 632 struct regulator_dev *rdev = dev_get_drvdata(dev); 633 kfree(rdev); 634} 635 636static struct class regulator_class = { 637 .name = "regulator", 638 .dev_release = regulator_dev_release, 639 .dev_attrs = regulator_dev_attrs, 640}; 641 642/* Calculate the new optimum regulator operating mode based on the new total 643 * consumer load. All locks held by caller */ 644static void drms_uA_update(struct regulator_dev *rdev) 645{ 646 struct regulator *sibling; 647 int current_uA = 0, output_uV, input_uV, err; 648 unsigned int mode; 649 650 err = regulator_check_drms(rdev); 651 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 652 (!rdev->desc->ops->get_voltage && 653 !rdev->desc->ops->get_voltage_sel) || 654 !rdev->desc->ops->set_mode) 655 return; 656 657 /* get output voltage */ 658 output_uV = _regulator_get_voltage(rdev); 659 if (output_uV <= 0) 660 return; 661 662 /* get input voltage */ 663 input_uV = 0; 664 if (rdev->supply) 665 input_uV = regulator_get_voltage(rdev->supply); 666 if (input_uV <= 0) 667 input_uV = rdev->constraints->input_uV; 668 if (input_uV <= 0) 669 return; 670 671 /* calc total requested load */ 672 list_for_each_entry(sibling, &rdev->consumer_list, list) 673 current_uA += sibling->uA_load; 674 675 /* now get the optimum mode for our new total regulator load */ 676 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 677 output_uV, current_uA); 678 679 /* check the new mode is allowed */ 680 err = regulator_mode_constrain(rdev, &mode); 681 if (err == 0) 682 rdev->desc->ops->set_mode(rdev, mode); 683} 684 685static int suspend_set_state(struct regulator_dev *rdev, 686 struct regulator_state *rstate) 687{ 688 int ret = 0; 689 690 /* If we have no suspend mode configration don't set anything; 691 * only warn if the driver implements set_suspend_voltage or 692 * set_suspend_mode callback. 693 */ 694 if (!rstate->enabled && !rstate->disabled) { 695 if (rdev->desc->ops->set_suspend_voltage || 696 rdev->desc->ops->set_suspend_mode) 697 rdev_warn(rdev, "No configuration\n"); 698 return 0; 699 } 700 701 if (rstate->enabled && rstate->disabled) { 702 rdev_err(rdev, "invalid configuration\n"); 703 return -EINVAL; 704 } 705 706 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 707 ret = rdev->desc->ops->set_suspend_enable(rdev); 708 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 709 ret = rdev->desc->ops->set_suspend_disable(rdev); 710 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 711 ret = 0; 712 713 if (ret < 0) { 714 rdev_err(rdev, "failed to enabled/disable\n"); 715 return ret; 716 } 717 718 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 719 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 720 if (ret < 0) { 721 rdev_err(rdev, "failed to set voltage\n"); 722 return ret; 723 } 724 } 725 726 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 727 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 728 if (ret < 0) { 729 rdev_err(rdev, "failed to set mode\n"); 730 return ret; 731 } 732 } 733 return ret; 734} 735 736/* locks held by caller */ 737static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 738{ 739 if (!rdev->constraints) 740 return -EINVAL; 741 742 switch (state) { 743 case PM_SUSPEND_STANDBY: 744 return suspend_set_state(rdev, 745 &rdev->constraints->state_standby); 746 case PM_SUSPEND_MEM: 747 return suspend_set_state(rdev, 748 &rdev->constraints->state_mem); 749 case PM_SUSPEND_MAX: 750 return suspend_set_state(rdev, 751 &rdev->constraints->state_disk); 752 default: 753 return -EINVAL; 754 } 755} 756 757static void print_constraints(struct regulator_dev *rdev) 758{ 759 struct regulation_constraints *constraints = rdev->constraints; 760 char buf[80] = ""; 761 int count = 0; 762 int ret; 763 764 if (constraints->min_uV && constraints->max_uV) { 765 if (constraints->min_uV == constraints->max_uV) 766 count += sprintf(buf + count, "%d mV ", 767 constraints->min_uV / 1000); 768 else 769 count += sprintf(buf + count, "%d <--> %d mV ", 770 constraints->min_uV / 1000, 771 constraints->max_uV / 1000); 772 } 773 774 if (!constraints->min_uV || 775 constraints->min_uV != constraints->max_uV) { 776 ret = _regulator_get_voltage(rdev); 777 if (ret > 0) 778 count += sprintf(buf + count, "at %d mV ", ret / 1000); 779 } 780 781 if (constraints->uV_offset) 782 count += sprintf(buf, "%dmV offset ", 783 constraints->uV_offset / 1000); 784 785 if (constraints->min_uA && constraints->max_uA) { 786 if (constraints->min_uA == constraints->max_uA) 787 count += sprintf(buf + count, "%d mA ", 788 constraints->min_uA / 1000); 789 else 790 count += sprintf(buf + count, "%d <--> %d mA ", 791 constraints->min_uA / 1000, 792 constraints->max_uA / 1000); 793 } 794 795 if (!constraints->min_uA || 796 constraints->min_uA != constraints->max_uA) { 797 ret = _regulator_get_current_limit(rdev); 798 if (ret > 0) 799 count += sprintf(buf + count, "at %d mA ", ret / 1000); 800 } 801 802 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 803 count += sprintf(buf + count, "fast "); 804 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 805 count += sprintf(buf + count, "normal "); 806 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 807 count += sprintf(buf + count, "idle "); 808 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 809 count += sprintf(buf + count, "standby"); 810 811 rdev_info(rdev, "%s\n", buf); 812 813 if ((constraints->min_uV != constraints->max_uV) && 814 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 815 rdev_warn(rdev, 816 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 817} 818 819static int machine_constraints_voltage(struct regulator_dev *rdev, 820 struct regulation_constraints *constraints) 821{ 822 struct regulator_ops *ops = rdev->desc->ops; 823 int ret; 824 825 /* do we need to apply the constraint voltage */ 826 if (rdev->constraints->apply_uV && 827 rdev->constraints->min_uV == rdev->constraints->max_uV) { 828 ret = _regulator_do_set_voltage(rdev, 829 rdev->constraints->min_uV, 830 rdev->constraints->max_uV); 831 if (ret < 0) { 832 rdev_err(rdev, "failed to apply %duV constraint\n", 833 rdev->constraints->min_uV); 834 return ret; 835 } 836 } 837 838 /* constrain machine-level voltage specs to fit 839 * the actual range supported by this regulator. 840 */ 841 if (ops->list_voltage && rdev->desc->n_voltages) { 842 int count = rdev->desc->n_voltages; 843 int i; 844 int min_uV = INT_MAX; 845 int max_uV = INT_MIN; 846 int cmin = constraints->min_uV; 847 int cmax = constraints->max_uV; 848 849 /* it's safe to autoconfigure fixed-voltage supplies 850 and the constraints are used by list_voltage. */ 851 if (count == 1 && !cmin) { 852 cmin = 1; 853 cmax = INT_MAX; 854 constraints->min_uV = cmin; 855 constraints->max_uV = cmax; 856 } 857 858 /* voltage constraints are optional */ 859 if ((cmin == 0) && (cmax == 0)) 860 return 0; 861 862 /* else require explicit machine-level constraints */ 863 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 864 rdev_err(rdev, "invalid voltage constraints\n"); 865 return -EINVAL; 866 } 867 868 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 869 for (i = 0; i < count; i++) { 870 int value; 871 872 value = ops->list_voltage(rdev, i); 873 if (value <= 0) 874 continue; 875 876 /* maybe adjust [min_uV..max_uV] */ 877 if (value >= cmin && value < min_uV) 878 min_uV = value; 879 if (value <= cmax && value > max_uV) 880 max_uV = value; 881 } 882 883 /* final: [min_uV..max_uV] valid iff constraints valid */ 884 if (max_uV < min_uV) { 885 rdev_err(rdev, "unsupportable voltage constraints\n"); 886 return -EINVAL; 887 } 888 889 /* use regulator's subset of machine constraints */ 890 if (constraints->min_uV < min_uV) { 891 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 892 constraints->min_uV, min_uV); 893 constraints->min_uV = min_uV; 894 } 895 if (constraints->max_uV > max_uV) { 896 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 897 constraints->max_uV, max_uV); 898 constraints->max_uV = max_uV; 899 } 900 } 901 902 return 0; 903} 904 905/** 906 * set_machine_constraints - sets regulator constraints 907 * @rdev: regulator source 908 * @constraints: constraints to apply 909 * 910 * Allows platform initialisation code to define and constrain 911 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 912 * Constraints *must* be set by platform code in order for some 913 * regulator operations to proceed i.e. set_voltage, set_current_limit, 914 * set_mode. 915 */ 916static int set_machine_constraints(struct regulator_dev *rdev, 917 const struct regulation_constraints *constraints) 918{ 919 int ret = 0; 920 struct regulator_ops *ops = rdev->desc->ops; 921 922 if (constraints) 923 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 924 GFP_KERNEL); 925 else 926 rdev->constraints = kzalloc(sizeof(*constraints), 927 GFP_KERNEL); 928 if (!rdev->constraints) 929 return -ENOMEM; 930 931 ret = machine_constraints_voltage(rdev, rdev->constraints); 932 if (ret != 0) 933 goto out; 934 935 /* do we need to setup our suspend state */ 936 if (rdev->constraints->initial_state) { 937 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 938 if (ret < 0) { 939 rdev_err(rdev, "failed to set suspend state\n"); 940 goto out; 941 } 942 } 943 944 if (rdev->constraints->initial_mode) { 945 if (!ops->set_mode) { 946 rdev_err(rdev, "no set_mode operation\n"); 947 ret = -EINVAL; 948 goto out; 949 } 950 951 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 952 if (ret < 0) { 953 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 954 goto out; 955 } 956 } 957 958 /* If the constraints say the regulator should be on at this point 959 * and we have control then make sure it is enabled. 960 */ 961 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 962 ops->enable) { 963 ret = ops->enable(rdev); 964 if (ret < 0) { 965 rdev_err(rdev, "failed to enable\n"); 966 goto out; 967 } 968 } 969 970 print_constraints(rdev); 971 return 0; 972out: 973 kfree(rdev->constraints); 974 rdev->constraints = NULL; 975 return ret; 976} 977 978/** 979 * set_supply - set regulator supply regulator 980 * @rdev: regulator name 981 * @supply_rdev: supply regulator name 982 * 983 * Called by platform initialisation code to set the supply regulator for this 984 * regulator. This ensures that a regulators supply will also be enabled by the 985 * core if it's child is enabled. 986 */ 987static int set_supply(struct regulator_dev *rdev, 988 struct regulator_dev *supply_rdev) 989{ 990 int err; 991 992 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 993 994 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 995 if (rdev->supply == NULL) { 996 err = -ENOMEM; 997 return err; 998 } 999 1000 return 0; 1001} 1002 1003/** 1004 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1005 * @rdev: regulator source 1006 * @consumer_dev_name: dev_name() string for device supply applies to 1007 * @supply: symbolic name for supply 1008 * 1009 * Allows platform initialisation code to map physical regulator 1010 * sources to symbolic names for supplies for use by devices. Devices 1011 * should use these symbolic names to request regulators, avoiding the 1012 * need to provide board-specific regulator names as platform data. 1013 */ 1014static int set_consumer_device_supply(struct regulator_dev *rdev, 1015 const char *consumer_dev_name, 1016 const char *supply) 1017{ 1018 struct regulator_map *node; 1019 int has_dev; 1020 1021 if (supply == NULL) 1022 return -EINVAL; 1023 1024 if (consumer_dev_name != NULL) 1025 has_dev = 1; 1026 else 1027 has_dev = 0; 1028 1029 list_for_each_entry(node, ®ulator_map_list, list) { 1030 if (node->dev_name && consumer_dev_name) { 1031 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1032 continue; 1033 } else if (node->dev_name || consumer_dev_name) { 1034 continue; 1035 } 1036 1037 if (strcmp(node->supply, supply) != 0) 1038 continue; 1039 1040 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1041 consumer_dev_name, 1042 dev_name(&node->regulator->dev), 1043 node->regulator->desc->name, 1044 supply, 1045 dev_name(&rdev->dev), rdev_get_name(rdev)); 1046 return -EBUSY; 1047 } 1048 1049 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1050 if (node == NULL) 1051 return -ENOMEM; 1052 1053 node->regulator = rdev; 1054 node->supply = supply; 1055 1056 if (has_dev) { 1057 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1058 if (node->dev_name == NULL) { 1059 kfree(node); 1060 return -ENOMEM; 1061 } 1062 } 1063 1064 list_add(&node->list, ®ulator_map_list); 1065 return 0; 1066} 1067 1068static void unset_regulator_supplies(struct regulator_dev *rdev) 1069{ 1070 struct regulator_map *node, *n; 1071 1072 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1073 if (rdev == node->regulator) { 1074 list_del(&node->list); 1075 kfree(node->dev_name); 1076 kfree(node); 1077 } 1078 } 1079} 1080 1081#define REG_STR_SIZE 64 1082 1083static struct regulator *create_regulator(struct regulator_dev *rdev, 1084 struct device *dev, 1085 const char *supply_name) 1086{ 1087 struct regulator *regulator; 1088 char buf[REG_STR_SIZE]; 1089 int err, size; 1090 1091 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1092 if (regulator == NULL) 1093 return NULL; 1094 1095 mutex_lock(&rdev->mutex); 1096 regulator->rdev = rdev; 1097 list_add(®ulator->list, &rdev->consumer_list); 1098 1099 if (dev) { 1100 /* create a 'requested_microamps_name' sysfs entry */ 1101 size = scnprintf(buf, REG_STR_SIZE, 1102 "microamps_requested_%s-%s", 1103 dev_name(dev), supply_name); 1104 if (size >= REG_STR_SIZE) 1105 goto overflow_err; 1106 1107 regulator->dev = dev; 1108 sysfs_attr_init(®ulator->dev_attr.attr); 1109 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1110 if (regulator->dev_attr.attr.name == NULL) 1111 goto attr_name_err; 1112 1113 regulator->dev_attr.attr.mode = 0444; 1114 regulator->dev_attr.show = device_requested_uA_show; 1115 err = device_create_file(dev, ®ulator->dev_attr); 1116 if (err < 0) { 1117 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); 1118 goto attr_name_err; 1119 } 1120 1121 /* also add a link to the device sysfs entry */ 1122 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1123 dev->kobj.name, supply_name); 1124 if (size >= REG_STR_SIZE) 1125 goto attr_err; 1126 1127 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1128 if (regulator->supply_name == NULL) 1129 goto attr_err; 1130 1131 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1132 buf); 1133 if (err) { 1134 rdev_warn(rdev, "could not add device link %s err %d\n", 1135 dev->kobj.name, err); 1136 goto link_name_err; 1137 } 1138 } else { 1139 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1140 if (regulator->supply_name == NULL) 1141 goto attr_err; 1142 } 1143 1144 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1145 rdev->debugfs); 1146 if (!regulator->debugfs) { 1147 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1148 } else { 1149 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1150 ®ulator->uA_load); 1151 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1152 ®ulator->min_uV); 1153 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1154 ®ulator->max_uV); 1155 } 1156 1157 /* 1158 * Check now if the regulator is an always on regulator - if 1159 * it is then we don't need to do nearly so much work for 1160 * enable/disable calls. 1161 */ 1162 if (!_regulator_can_change_status(rdev) && 1163 _regulator_is_enabled(rdev)) 1164 regulator->always_on = true; 1165 1166 mutex_unlock(&rdev->mutex); 1167 return regulator; 1168link_name_err: 1169 kfree(regulator->supply_name); 1170attr_err: 1171 device_remove_file(regulator->dev, ®ulator->dev_attr); 1172attr_name_err: 1173 kfree(regulator->dev_attr.attr.name); 1174overflow_err: 1175 list_del(®ulator->list); 1176 kfree(regulator); 1177 mutex_unlock(&rdev->mutex); 1178 return NULL; 1179} 1180 1181static int _regulator_get_enable_time(struct regulator_dev *rdev) 1182{ 1183 if (!rdev->desc->ops->enable_time) 1184 return 0; 1185 return rdev->desc->ops->enable_time(rdev); 1186} 1187 1188static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1189 const char *supply, 1190 int *ret) 1191{ 1192 struct regulator_dev *r; 1193 struct device_node *node; 1194 struct regulator_map *map; 1195 const char *devname = NULL; 1196 1197 /* first do a dt based lookup */ 1198 if (dev && dev->of_node) { 1199 node = of_get_regulator(dev, supply); 1200 if (node) { 1201 list_for_each_entry(r, ®ulator_list, list) 1202 if (r->dev.parent && 1203 node == r->dev.of_node) 1204 return r; 1205 } else { 1206 /* 1207 * If we couldn't even get the node then it's 1208 * not just that the device didn't register 1209 * yet, there's no node and we'll never 1210 * succeed. 1211 */ 1212 *ret = -ENODEV; 1213 } 1214 } 1215 1216 /* if not found, try doing it non-dt way */ 1217 if (dev) 1218 devname = dev_name(dev); 1219 1220 list_for_each_entry(r, ®ulator_list, list) 1221 if (strcmp(rdev_get_name(r), supply) == 0) 1222 return r; 1223 1224 list_for_each_entry(map, ®ulator_map_list, list) { 1225 /* If the mapping has a device set up it must match */ 1226 if (map->dev_name && 1227 (!devname || strcmp(map->dev_name, devname))) 1228 continue; 1229 1230 if (strcmp(map->supply, supply) == 0) 1231 return map->regulator; 1232 } 1233 1234 1235 return NULL; 1236} 1237 1238/* Internal regulator request function */ 1239static struct regulator *_regulator_get(struct device *dev, const char *id, 1240 int exclusive) 1241{ 1242 struct regulator_dev *rdev; 1243 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1244 const char *devname = NULL; 1245 int ret; 1246 1247 if (id == NULL) { 1248 pr_err("get() with no identifier\n"); 1249 return regulator; 1250 } 1251 1252 if (dev) 1253 devname = dev_name(dev); 1254 1255 mutex_lock(®ulator_list_mutex); 1256 1257 rdev = regulator_dev_lookup(dev, id, &ret); 1258 if (rdev) 1259 goto found; 1260 1261 if (board_wants_dummy_regulator) { 1262 rdev = dummy_regulator_rdev; 1263 goto found; 1264 } 1265 1266#ifdef CONFIG_REGULATOR_DUMMY 1267 if (!devname) 1268 devname = "deviceless"; 1269 1270 /* If the board didn't flag that it was fully constrained then 1271 * substitute in a dummy regulator so consumers can continue. 1272 */ 1273 if (!has_full_constraints) { 1274 pr_warn("%s supply %s not found, using dummy regulator\n", 1275 devname, id); 1276 rdev = dummy_regulator_rdev; 1277 goto found; 1278 } 1279#endif 1280 1281 mutex_unlock(®ulator_list_mutex); 1282 return regulator; 1283 1284found: 1285 if (rdev->exclusive) { 1286 regulator = ERR_PTR(-EPERM); 1287 goto out; 1288 } 1289 1290 if (exclusive && rdev->open_count) { 1291 regulator = ERR_PTR(-EBUSY); 1292 goto out; 1293 } 1294 1295 if (!try_module_get(rdev->owner)) 1296 goto out; 1297 1298 regulator = create_regulator(rdev, dev, id); 1299 if (regulator == NULL) { 1300 regulator = ERR_PTR(-ENOMEM); 1301 module_put(rdev->owner); 1302 goto out; 1303 } 1304 1305 rdev->open_count++; 1306 if (exclusive) { 1307 rdev->exclusive = 1; 1308 1309 ret = _regulator_is_enabled(rdev); 1310 if (ret > 0) 1311 rdev->use_count = 1; 1312 else 1313 rdev->use_count = 0; 1314 } 1315 1316out: 1317 mutex_unlock(®ulator_list_mutex); 1318 1319 return regulator; 1320} 1321 1322/** 1323 * regulator_get - lookup and obtain a reference to a regulator. 1324 * @dev: device for regulator "consumer" 1325 * @id: Supply name or regulator ID. 1326 * 1327 * Returns a struct regulator corresponding to the regulator producer, 1328 * or IS_ERR() condition containing errno. 1329 * 1330 * Use of supply names configured via regulator_set_device_supply() is 1331 * strongly encouraged. It is recommended that the supply name used 1332 * should match the name used for the supply and/or the relevant 1333 * device pins in the datasheet. 1334 */ 1335struct regulator *regulator_get(struct device *dev, const char *id) 1336{ 1337 return _regulator_get(dev, id, 0); 1338} 1339EXPORT_SYMBOL_GPL(regulator_get); 1340 1341static void devm_regulator_release(struct device *dev, void *res) 1342{ 1343 regulator_put(*(struct regulator **)res); 1344} 1345 1346/** 1347 * devm_regulator_get - Resource managed regulator_get() 1348 * @dev: device for regulator "consumer" 1349 * @id: Supply name or regulator ID. 1350 * 1351 * Managed regulator_get(). Regulators returned from this function are 1352 * automatically regulator_put() on driver detach. See regulator_get() for more 1353 * information. 1354 */ 1355struct regulator *devm_regulator_get(struct device *dev, const char *id) 1356{ 1357 struct regulator **ptr, *regulator; 1358 1359 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1360 if (!ptr) 1361 return ERR_PTR(-ENOMEM); 1362 1363 regulator = regulator_get(dev, id); 1364 if (!IS_ERR(regulator)) { 1365 *ptr = regulator; 1366 devres_add(dev, ptr); 1367 } else { 1368 devres_free(ptr); 1369 } 1370 1371 return regulator; 1372} 1373EXPORT_SYMBOL_GPL(devm_regulator_get); 1374 1375/** 1376 * regulator_get_exclusive - obtain exclusive access to a regulator. 1377 * @dev: device for regulator "consumer" 1378 * @id: Supply name or regulator ID. 1379 * 1380 * Returns a struct regulator corresponding to the regulator producer, 1381 * or IS_ERR() condition containing errno. Other consumers will be 1382 * unable to obtain this reference is held and the use count for the 1383 * regulator will be initialised to reflect the current state of the 1384 * regulator. 1385 * 1386 * This is intended for use by consumers which cannot tolerate shared 1387 * use of the regulator such as those which need to force the 1388 * regulator off for correct operation of the hardware they are 1389 * controlling. 1390 * 1391 * Use of supply names configured via regulator_set_device_supply() is 1392 * strongly encouraged. It is recommended that the supply name used 1393 * should match the name used for the supply and/or the relevant 1394 * device pins in the datasheet. 1395 */ 1396struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1397{ 1398 return _regulator_get(dev, id, 1); 1399} 1400EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1401 1402/** 1403 * regulator_put - "free" the regulator source 1404 * @regulator: regulator source 1405 * 1406 * Note: drivers must ensure that all regulator_enable calls made on this 1407 * regulator source are balanced by regulator_disable calls prior to calling 1408 * this function. 1409 */ 1410void regulator_put(struct regulator *regulator) 1411{ 1412 struct regulator_dev *rdev; 1413 1414 if (regulator == NULL || IS_ERR(regulator)) 1415 return; 1416 1417 mutex_lock(®ulator_list_mutex); 1418 rdev = regulator->rdev; 1419 1420 debugfs_remove_recursive(regulator->debugfs); 1421 1422 /* remove any sysfs entries */ 1423 if (regulator->dev) { 1424 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1425 device_remove_file(regulator->dev, ®ulator->dev_attr); 1426 kfree(regulator->dev_attr.attr.name); 1427 } 1428 kfree(regulator->supply_name); 1429 list_del(®ulator->list); 1430 kfree(regulator); 1431 1432 rdev->open_count--; 1433 rdev->exclusive = 0; 1434 1435 module_put(rdev->owner); 1436 mutex_unlock(®ulator_list_mutex); 1437} 1438EXPORT_SYMBOL_GPL(regulator_put); 1439 1440static int devm_regulator_match(struct device *dev, void *res, void *data) 1441{ 1442 struct regulator **r = res; 1443 if (!r || !*r) { 1444 WARN_ON(!r || !*r); 1445 return 0; 1446 } 1447 return *r == data; 1448} 1449 1450/** 1451 * devm_regulator_put - Resource managed regulator_put() 1452 * @regulator: regulator to free 1453 * 1454 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1455 * this function will not need to be called and the resource management 1456 * code will ensure that the resource is freed. 1457 */ 1458void devm_regulator_put(struct regulator *regulator) 1459{ 1460 int rc; 1461 1462 rc = devres_release(regulator->dev, devm_regulator_release, 1463 devm_regulator_match, regulator); 1464 if (rc == 0) 1465 regulator_put(regulator); 1466 else 1467 WARN_ON(rc); 1468} 1469EXPORT_SYMBOL_GPL(devm_regulator_put); 1470 1471/* locks held by regulator_enable() */ 1472static int _regulator_enable(struct regulator_dev *rdev) 1473{ 1474 int ret, delay; 1475 1476 /* check voltage and requested load before enabling */ 1477 if (rdev->constraints && 1478 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1479 drms_uA_update(rdev); 1480 1481 if (rdev->use_count == 0) { 1482 /* The regulator may on if it's not switchable or left on */ 1483 ret = _regulator_is_enabled(rdev); 1484 if (ret == -EINVAL || ret == 0) { 1485 if (!_regulator_can_change_status(rdev)) 1486 return -EPERM; 1487 1488 if (!rdev->desc->ops->enable) 1489 return -EINVAL; 1490 1491 /* Query before enabling in case configuration 1492 * dependent. */ 1493 ret = _regulator_get_enable_time(rdev); 1494 if (ret >= 0) { 1495 delay = ret; 1496 } else { 1497 rdev_warn(rdev, "enable_time() failed: %d\n", 1498 ret); 1499 delay = 0; 1500 } 1501 1502 trace_regulator_enable(rdev_get_name(rdev)); 1503 1504 /* Allow the regulator to ramp; it would be useful 1505 * to extend this for bulk operations so that the 1506 * regulators can ramp together. */ 1507 ret = rdev->desc->ops->enable(rdev); 1508 if (ret < 0) 1509 return ret; 1510 1511 trace_regulator_enable_delay(rdev_get_name(rdev)); 1512 1513 if (delay >= 1000) { 1514 mdelay(delay / 1000); 1515 udelay(delay % 1000); 1516 } else if (delay) { 1517 udelay(delay); 1518 } 1519 1520 trace_regulator_enable_complete(rdev_get_name(rdev)); 1521 1522 } else if (ret < 0) { 1523 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1524 return ret; 1525 } 1526 /* Fallthrough on positive return values - already enabled */ 1527 } 1528 1529 rdev->use_count++; 1530 1531 return 0; 1532} 1533 1534/** 1535 * regulator_enable - enable regulator output 1536 * @regulator: regulator source 1537 * 1538 * Request that the regulator be enabled with the regulator output at 1539 * the predefined voltage or current value. Calls to regulator_enable() 1540 * must be balanced with calls to regulator_disable(). 1541 * 1542 * NOTE: the output value can be set by other drivers, boot loader or may be 1543 * hardwired in the regulator. 1544 */ 1545int regulator_enable(struct regulator *regulator) 1546{ 1547 struct regulator_dev *rdev = regulator->rdev; 1548 int ret = 0; 1549 1550 if (regulator->always_on) 1551 return 0; 1552 1553 if (rdev->supply) { 1554 ret = regulator_enable(rdev->supply); 1555 if (ret != 0) 1556 return ret; 1557 } 1558 1559 mutex_lock(&rdev->mutex); 1560 ret = _regulator_enable(rdev); 1561 mutex_unlock(&rdev->mutex); 1562 1563 if (ret != 0 && rdev->supply) 1564 regulator_disable(rdev->supply); 1565 1566 return ret; 1567} 1568EXPORT_SYMBOL_GPL(regulator_enable); 1569 1570/* locks held by regulator_disable() */ 1571static int _regulator_disable(struct regulator_dev *rdev) 1572{ 1573 int ret = 0; 1574 1575 if (WARN(rdev->use_count <= 0, 1576 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1577 return -EIO; 1578 1579 /* are we the last user and permitted to disable ? */ 1580 if (rdev->use_count == 1 && 1581 (rdev->constraints && !rdev->constraints->always_on)) { 1582 1583 /* we are last user */ 1584 if (_regulator_can_change_status(rdev) && 1585 rdev->desc->ops->disable) { 1586 trace_regulator_disable(rdev_get_name(rdev)); 1587 1588 ret = rdev->desc->ops->disable(rdev); 1589 if (ret < 0) { 1590 rdev_err(rdev, "failed to disable\n"); 1591 return ret; 1592 } 1593 1594 trace_regulator_disable_complete(rdev_get_name(rdev)); 1595 1596 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1597 NULL); 1598 } 1599 1600 rdev->use_count = 0; 1601 } else if (rdev->use_count > 1) { 1602 1603 if (rdev->constraints && 1604 (rdev->constraints->valid_ops_mask & 1605 REGULATOR_CHANGE_DRMS)) 1606 drms_uA_update(rdev); 1607 1608 rdev->use_count--; 1609 } 1610 1611 return ret; 1612} 1613 1614/** 1615 * regulator_disable - disable regulator output 1616 * @regulator: regulator source 1617 * 1618 * Disable the regulator output voltage or current. Calls to 1619 * regulator_enable() must be balanced with calls to 1620 * regulator_disable(). 1621 * 1622 * NOTE: this will only disable the regulator output if no other consumer 1623 * devices have it enabled, the regulator device supports disabling and 1624 * machine constraints permit this operation. 1625 */ 1626int regulator_disable(struct regulator *regulator) 1627{ 1628 struct regulator_dev *rdev = regulator->rdev; 1629 int ret = 0; 1630 1631 if (regulator->always_on) 1632 return 0; 1633 1634 mutex_lock(&rdev->mutex); 1635 ret = _regulator_disable(rdev); 1636 mutex_unlock(&rdev->mutex); 1637 1638 if (ret == 0 && rdev->supply) 1639 regulator_disable(rdev->supply); 1640 1641 return ret; 1642} 1643EXPORT_SYMBOL_GPL(regulator_disable); 1644 1645/* locks held by regulator_force_disable() */ 1646static int _regulator_force_disable(struct regulator_dev *rdev) 1647{ 1648 int ret = 0; 1649 1650 /* force disable */ 1651 if (rdev->desc->ops->disable) { 1652 /* ah well, who wants to live forever... */ 1653 ret = rdev->desc->ops->disable(rdev); 1654 if (ret < 0) { 1655 rdev_err(rdev, "failed to force disable\n"); 1656 return ret; 1657 } 1658 /* notify other consumers that power has been forced off */ 1659 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1660 REGULATOR_EVENT_DISABLE, NULL); 1661 } 1662 1663 return ret; 1664} 1665 1666/** 1667 * regulator_force_disable - force disable regulator output 1668 * @regulator: regulator source 1669 * 1670 * Forcibly disable the regulator output voltage or current. 1671 * NOTE: this *will* disable the regulator output even if other consumer 1672 * devices have it enabled. This should be used for situations when device 1673 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1674 */ 1675int regulator_force_disable(struct regulator *regulator) 1676{ 1677 struct regulator_dev *rdev = regulator->rdev; 1678 int ret; 1679 1680 mutex_lock(&rdev->mutex); 1681 regulator->uA_load = 0; 1682 ret = _regulator_force_disable(regulator->rdev); 1683 mutex_unlock(&rdev->mutex); 1684 1685 if (rdev->supply) 1686 while (rdev->open_count--) 1687 regulator_disable(rdev->supply); 1688 1689 return ret; 1690} 1691EXPORT_SYMBOL_GPL(regulator_force_disable); 1692 1693static void regulator_disable_work(struct work_struct *work) 1694{ 1695 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1696 disable_work.work); 1697 int count, i, ret; 1698 1699 mutex_lock(&rdev->mutex); 1700 1701 BUG_ON(!rdev->deferred_disables); 1702 1703 count = rdev->deferred_disables; 1704 rdev->deferred_disables = 0; 1705 1706 for (i = 0; i < count; i++) { 1707 ret = _regulator_disable(rdev); 1708 if (ret != 0) 1709 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1710 } 1711 1712 mutex_unlock(&rdev->mutex); 1713 1714 if (rdev->supply) { 1715 for (i = 0; i < count; i++) { 1716 ret = regulator_disable(rdev->supply); 1717 if (ret != 0) { 1718 rdev_err(rdev, 1719 "Supply disable failed: %d\n", ret); 1720 } 1721 } 1722 } 1723} 1724 1725/** 1726 * regulator_disable_deferred - disable regulator output with delay 1727 * @regulator: regulator source 1728 * @ms: miliseconds until the regulator is disabled 1729 * 1730 * Execute regulator_disable() on the regulator after a delay. This 1731 * is intended for use with devices that require some time to quiesce. 1732 * 1733 * NOTE: this will only disable the regulator output if no other consumer 1734 * devices have it enabled, the regulator device supports disabling and 1735 * machine constraints permit this operation. 1736 */ 1737int regulator_disable_deferred(struct regulator *regulator, int ms) 1738{ 1739 struct regulator_dev *rdev = regulator->rdev; 1740 int ret; 1741 1742 if (regulator->always_on) 1743 return 0; 1744 1745 mutex_lock(&rdev->mutex); 1746 rdev->deferred_disables++; 1747 mutex_unlock(&rdev->mutex); 1748 1749 ret = schedule_delayed_work(&rdev->disable_work, 1750 msecs_to_jiffies(ms)); 1751 if (ret < 0) 1752 return ret; 1753 else 1754 return 0; 1755} 1756EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1757 1758/** 1759 * regulator_is_enabled_regmap - standard is_enabled() for regmap users 1760 * 1761 * @rdev: regulator to operate on 1762 * 1763 * Regulators that use regmap for their register I/O can set the 1764 * enable_reg and enable_mask fields in their descriptor and then use 1765 * this as their is_enabled operation, saving some code. 1766 */ 1767int regulator_is_enabled_regmap(struct regulator_dev *rdev) 1768{ 1769 unsigned int val; 1770 int ret; 1771 1772 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); 1773 if (ret != 0) 1774 return ret; 1775 1776 return (val & rdev->desc->enable_mask) != 0; 1777} 1778EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); 1779 1780/** 1781 * regulator_enable_regmap - standard enable() for regmap users 1782 * 1783 * @rdev: regulator to operate on 1784 * 1785 * Regulators that use regmap for their register I/O can set the 1786 * enable_reg and enable_mask fields in their descriptor and then use 1787 * this as their enable() operation, saving some code. 1788 */ 1789int regulator_enable_regmap(struct regulator_dev *rdev) 1790{ 1791 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1792 rdev->desc->enable_mask, 1793 rdev->desc->enable_mask); 1794} 1795EXPORT_SYMBOL_GPL(regulator_enable_regmap); 1796 1797/** 1798 * regulator_disable_regmap - standard disable() for regmap users 1799 * 1800 * @rdev: regulator to operate on 1801 * 1802 * Regulators that use regmap for their register I/O can set the 1803 * enable_reg and enable_mask fields in their descriptor and then use 1804 * this as their disable() operation, saving some code. 1805 */ 1806int regulator_disable_regmap(struct regulator_dev *rdev) 1807{ 1808 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1809 rdev->desc->enable_mask, 0); 1810} 1811EXPORT_SYMBOL_GPL(regulator_disable_regmap); 1812 1813static int _regulator_is_enabled(struct regulator_dev *rdev) 1814{ 1815 /* If we don't know then assume that the regulator is always on */ 1816 if (!rdev->desc->ops->is_enabled) 1817 return 1; 1818 1819 return rdev->desc->ops->is_enabled(rdev); 1820} 1821 1822/** 1823 * regulator_is_enabled - is the regulator output enabled 1824 * @regulator: regulator source 1825 * 1826 * Returns positive if the regulator driver backing the source/client 1827 * has requested that the device be enabled, zero if it hasn't, else a 1828 * negative errno code. 1829 * 1830 * Note that the device backing this regulator handle can have multiple 1831 * users, so it might be enabled even if regulator_enable() was never 1832 * called for this particular source. 1833 */ 1834int regulator_is_enabled(struct regulator *regulator) 1835{ 1836 int ret; 1837 1838 if (regulator->always_on) 1839 return 1; 1840 1841 mutex_lock(®ulator->rdev->mutex); 1842 ret = _regulator_is_enabled(regulator->rdev); 1843 mutex_unlock(®ulator->rdev->mutex); 1844 1845 return ret; 1846} 1847EXPORT_SYMBOL_GPL(regulator_is_enabled); 1848 1849/** 1850 * regulator_count_voltages - count regulator_list_voltage() selectors 1851 * @regulator: regulator source 1852 * 1853 * Returns number of selectors, or negative errno. Selectors are 1854 * numbered starting at zero, and typically correspond to bitfields 1855 * in hardware registers. 1856 */ 1857int regulator_count_voltages(struct regulator *regulator) 1858{ 1859 struct regulator_dev *rdev = regulator->rdev; 1860 1861 return rdev->desc->n_voltages ? : -EINVAL; 1862} 1863EXPORT_SYMBOL_GPL(regulator_count_voltages); 1864 1865/** 1866 * regulator_list_voltage_linear - List voltages with simple calculation 1867 * 1868 * @rdev: Regulator device 1869 * @selector: Selector to convert into a voltage 1870 * 1871 * Regulators with a simple linear mapping between voltages and 1872 * selectors can set min_uV and uV_step in the regulator descriptor 1873 * and then use this function as their list_voltage() operation, 1874 */ 1875int regulator_list_voltage_linear(struct regulator_dev *rdev, 1876 unsigned int selector) 1877{ 1878 if (selector >= rdev->desc->n_voltages) 1879 return -EINVAL; 1880 1881 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 1882} 1883EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); 1884 1885/** 1886 * regulator_list_voltage_table - List voltages with table based mapping 1887 * 1888 * @rdev: Regulator device 1889 * @selector: Selector to convert into a voltage 1890 * 1891 * Regulators with table based mapping between voltages and 1892 * selectors can set volt_table in the regulator descriptor 1893 * and then use this function as their list_voltage() operation. 1894 */ 1895int regulator_list_voltage_table(struct regulator_dev *rdev, 1896 unsigned int selector) 1897{ 1898 if (!rdev->desc->volt_table) { 1899 BUG_ON(!rdev->desc->volt_table); 1900 return -EINVAL; 1901 } 1902 1903 if (selector >= rdev->desc->n_voltages) 1904 return -EINVAL; 1905 1906 return rdev->desc->volt_table[selector]; 1907} 1908EXPORT_SYMBOL_GPL(regulator_list_voltage_table); 1909 1910/** 1911 * regulator_list_voltage - enumerate supported voltages 1912 * @regulator: regulator source 1913 * @selector: identify voltage to list 1914 * Context: can sleep 1915 * 1916 * Returns a voltage that can be passed to @regulator_set_voltage(), 1917 * zero if this selector code can't be used on this system, or a 1918 * negative errno. 1919 */ 1920int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1921{ 1922 struct regulator_dev *rdev = regulator->rdev; 1923 struct regulator_ops *ops = rdev->desc->ops; 1924 int ret; 1925 1926 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1927 return -EINVAL; 1928 1929 mutex_lock(&rdev->mutex); 1930 ret = ops->list_voltage(rdev, selector); 1931 mutex_unlock(&rdev->mutex); 1932 1933 if (ret > 0) { 1934 if (ret < rdev->constraints->min_uV) 1935 ret = 0; 1936 else if (ret > rdev->constraints->max_uV) 1937 ret = 0; 1938 } 1939 1940 return ret; 1941} 1942EXPORT_SYMBOL_GPL(regulator_list_voltage); 1943 1944/** 1945 * regulator_is_supported_voltage - check if a voltage range can be supported 1946 * 1947 * @regulator: Regulator to check. 1948 * @min_uV: Minimum required voltage in uV. 1949 * @max_uV: Maximum required voltage in uV. 1950 * 1951 * Returns a boolean or a negative error code. 1952 */ 1953int regulator_is_supported_voltage(struct regulator *regulator, 1954 int min_uV, int max_uV) 1955{ 1956 int i, voltages, ret; 1957 1958 ret = regulator_count_voltages(regulator); 1959 if (ret < 0) 1960 return ret; 1961 voltages = ret; 1962 1963 for (i = 0; i < voltages; i++) { 1964 ret = regulator_list_voltage(regulator, i); 1965 1966 if (ret >= min_uV && ret <= max_uV) 1967 return 1; 1968 } 1969 1970 return 0; 1971} 1972EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1973 1974/** 1975 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 1976 * 1977 * @rdev: regulator to operate on 1978 * 1979 * Regulators that use regmap for their register I/O can set the 1980 * vsel_reg and vsel_mask fields in their descriptor and then use this 1981 * as their get_voltage_vsel operation, saving some code. 1982 */ 1983int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 1984{ 1985 unsigned int val; 1986 int ret; 1987 1988 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 1989 if (ret != 0) 1990 return ret; 1991 1992 val &= rdev->desc->vsel_mask; 1993 val >>= ffs(rdev->desc->vsel_mask) - 1; 1994 1995 return val; 1996} 1997EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 1998 1999/** 2000 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 2001 * 2002 * @rdev: regulator to operate on 2003 * @sel: Selector to set 2004 * 2005 * Regulators that use regmap for their register I/O can set the 2006 * vsel_reg and vsel_mask fields in their descriptor and then use this 2007 * as their set_voltage_vsel operation, saving some code. 2008 */ 2009int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 2010{ 2011 sel <<= ffs(rdev->desc->vsel_mask) - 1; 2012 2013 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 2014 rdev->desc->vsel_mask, sel); 2015} 2016EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 2017 2018/** 2019 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 2020 * 2021 * @rdev: Regulator to operate on 2022 * @min_uV: Lower bound for voltage 2023 * @max_uV: Upper bound for voltage 2024 * 2025 * Drivers implementing set_voltage_sel() and list_voltage() can use 2026 * this as their map_voltage() operation. It will find a suitable 2027 * voltage by calling list_voltage() until it gets something in bounds 2028 * for the requested voltages. 2029 */ 2030int regulator_map_voltage_iterate(struct regulator_dev *rdev, 2031 int min_uV, int max_uV) 2032{ 2033 int best_val = INT_MAX; 2034 int selector = 0; 2035 int i, ret; 2036 2037 /* Find the smallest voltage that falls within the specified 2038 * range. 2039 */ 2040 for (i = 0; i < rdev->desc->n_voltages; i++) { 2041 ret = rdev->desc->ops->list_voltage(rdev, i); 2042 if (ret < 0) 2043 continue; 2044 2045 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 2046 best_val = ret; 2047 selector = i; 2048 } 2049 } 2050 2051 if (best_val != INT_MAX) 2052 return selector; 2053 else 2054 return -EINVAL; 2055} 2056EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2057 2058/** 2059 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 2060 * 2061 * @rdev: Regulator to operate on 2062 * @min_uV: Lower bound for voltage 2063 * @max_uV: Upper bound for voltage 2064 * 2065 * Drivers providing min_uV and uV_step in their regulator_desc can 2066 * use this as their map_voltage() operation. 2067 */ 2068int regulator_map_voltage_linear(struct regulator_dev *rdev, 2069 int min_uV, int max_uV) 2070{ 2071 int ret, voltage; 2072 2073 if (!rdev->desc->uV_step) { 2074 BUG_ON(!rdev->desc->uV_step); 2075 return -EINVAL; 2076 } 2077 2078 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2079 if (ret < 0) 2080 return ret; 2081 2082 /* Map back into a voltage to verify we're still in bounds */ 2083 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2084 if (voltage < min_uV || voltage > max_uV) 2085 return -EINVAL; 2086 2087 return ret; 2088} 2089EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2090 2091static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2092 int min_uV, int max_uV) 2093{ 2094 int ret; 2095 int delay = 0; 2096 int best_val; 2097 unsigned int selector; 2098 int old_selector = -1; 2099 2100 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2101 2102 min_uV += rdev->constraints->uV_offset; 2103 max_uV += rdev->constraints->uV_offset; 2104 2105 /* 2106 * If we can't obtain the old selector there is not enough 2107 * info to call set_voltage_time_sel(). 2108 */ 2109 if (_regulator_is_enabled(rdev) && 2110 rdev->desc->ops->set_voltage_time_sel && 2111 rdev->desc->ops->get_voltage_sel) { 2112 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2113 if (old_selector < 0) 2114 return old_selector; 2115 } 2116 2117 if (rdev->desc->ops->set_voltage) { 2118 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2119 &selector); 2120 } else if (rdev->desc->ops->set_voltage_sel) { 2121 if (rdev->desc->ops->map_voltage) { 2122 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2123 max_uV); 2124 } else { 2125 if (rdev->desc->ops->list_voltage == 2126 regulator_list_voltage_linear) 2127 ret = regulator_map_voltage_linear(rdev, 2128 min_uV, max_uV); 2129 else 2130 ret = regulator_map_voltage_iterate(rdev, 2131 min_uV, max_uV); 2132 } 2133 2134 if (ret >= 0) { 2135 selector = ret; 2136 ret = rdev->desc->ops->set_voltage_sel(rdev, ret); 2137 } 2138 } else { 2139 ret = -EINVAL; 2140 } 2141 2142 if (rdev->desc->ops->list_voltage) 2143 best_val = rdev->desc->ops->list_voltage(rdev, selector); 2144 else 2145 best_val = -1; 2146 2147 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2148 if (_regulator_is_enabled(rdev) && ret == 0 && old_selector >= 0 && 2149 rdev->desc->ops->set_voltage_time_sel) { 2150 2151 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2152 old_selector, selector); 2153 if (delay < 0) { 2154 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2155 delay); 2156 delay = 0; 2157 } 2158 } 2159 2160 /* Insert any necessary delays */ 2161 if (delay >= 1000) { 2162 mdelay(delay / 1000); 2163 udelay(delay % 1000); 2164 } else if (delay) { 2165 udelay(delay); 2166 } 2167 2168 if (ret == 0) 2169 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2170 NULL); 2171 2172 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2173 2174 return ret; 2175} 2176 2177/** 2178 * regulator_set_voltage - set regulator output voltage 2179 * @regulator: regulator source 2180 * @min_uV: Minimum required voltage in uV 2181 * @max_uV: Maximum acceptable voltage in uV 2182 * 2183 * Sets a voltage regulator to the desired output voltage. This can be set 2184 * during any regulator state. IOW, regulator can be disabled or enabled. 2185 * 2186 * If the regulator is enabled then the voltage will change to the new value 2187 * immediately otherwise if the regulator is disabled the regulator will 2188 * output at the new voltage when enabled. 2189 * 2190 * NOTE: If the regulator is shared between several devices then the lowest 2191 * request voltage that meets the system constraints will be used. 2192 * Regulator system constraints must be set for this regulator before 2193 * calling this function otherwise this call will fail. 2194 */ 2195int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2196{ 2197 struct regulator_dev *rdev = regulator->rdev; 2198 int ret = 0; 2199 2200 mutex_lock(&rdev->mutex); 2201 2202 /* If we're setting the same range as last time the change 2203 * should be a noop (some cpufreq implementations use the same 2204 * voltage for multiple frequencies, for example). 2205 */ 2206 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2207 goto out; 2208 2209 /* sanity check */ 2210 if (!rdev->desc->ops->set_voltage && 2211 !rdev->desc->ops->set_voltage_sel) { 2212 ret = -EINVAL; 2213 goto out; 2214 } 2215 2216 /* constraints check */ 2217 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2218 if (ret < 0) 2219 goto out; 2220 regulator->min_uV = min_uV; 2221 regulator->max_uV = max_uV; 2222 2223 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2224 if (ret < 0) 2225 goto out; 2226 2227 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2228 2229out: 2230 mutex_unlock(&rdev->mutex); 2231 return ret; 2232} 2233EXPORT_SYMBOL_GPL(regulator_set_voltage); 2234 2235/** 2236 * regulator_set_voltage_time - get raise/fall time 2237 * @regulator: regulator source 2238 * @old_uV: starting voltage in microvolts 2239 * @new_uV: target voltage in microvolts 2240 * 2241 * Provided with the starting and ending voltage, this function attempts to 2242 * calculate the time in microseconds required to rise or fall to this new 2243 * voltage. 2244 */ 2245int regulator_set_voltage_time(struct regulator *regulator, 2246 int old_uV, int new_uV) 2247{ 2248 struct regulator_dev *rdev = regulator->rdev; 2249 struct regulator_ops *ops = rdev->desc->ops; 2250 int old_sel = -1; 2251 int new_sel = -1; 2252 int voltage; 2253 int i; 2254 2255 /* Currently requires operations to do this */ 2256 if (!ops->list_voltage || !ops->set_voltage_time_sel 2257 || !rdev->desc->n_voltages) 2258 return -EINVAL; 2259 2260 for (i = 0; i < rdev->desc->n_voltages; i++) { 2261 /* We only look for exact voltage matches here */ 2262 voltage = regulator_list_voltage(regulator, i); 2263 if (voltage < 0) 2264 return -EINVAL; 2265 if (voltage == 0) 2266 continue; 2267 if (voltage == old_uV) 2268 old_sel = i; 2269 if (voltage == new_uV) 2270 new_sel = i; 2271 } 2272 2273 if (old_sel < 0 || new_sel < 0) 2274 return -EINVAL; 2275 2276 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2277} 2278EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2279 2280/** 2281 * regulator_sync_voltage - re-apply last regulator output voltage 2282 * @regulator: regulator source 2283 * 2284 * Re-apply the last configured voltage. This is intended to be used 2285 * where some external control source the consumer is cooperating with 2286 * has caused the configured voltage to change. 2287 */ 2288int regulator_sync_voltage(struct regulator *regulator) 2289{ 2290 struct regulator_dev *rdev = regulator->rdev; 2291 int ret, min_uV, max_uV; 2292 2293 mutex_lock(&rdev->mutex); 2294 2295 if (!rdev->desc->ops->set_voltage && 2296 !rdev->desc->ops->set_voltage_sel) { 2297 ret = -EINVAL; 2298 goto out; 2299 } 2300 2301 /* This is only going to work if we've had a voltage configured. */ 2302 if (!regulator->min_uV && !regulator->max_uV) { 2303 ret = -EINVAL; 2304 goto out; 2305 } 2306 2307 min_uV = regulator->min_uV; 2308 max_uV = regulator->max_uV; 2309 2310 /* This should be a paranoia check... */ 2311 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2312 if (ret < 0) 2313 goto out; 2314 2315 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2316 if (ret < 0) 2317 goto out; 2318 2319 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2320 2321out: 2322 mutex_unlock(&rdev->mutex); 2323 return ret; 2324} 2325EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2326 2327static int _regulator_get_voltage(struct regulator_dev *rdev) 2328{ 2329 int sel, ret; 2330 2331 if (rdev->desc->ops->get_voltage_sel) { 2332 sel = rdev->desc->ops->get_voltage_sel(rdev); 2333 if (sel < 0) 2334 return sel; 2335 ret = rdev->desc->ops->list_voltage(rdev, sel); 2336 } else if (rdev->desc->ops->get_voltage) { 2337 ret = rdev->desc->ops->get_voltage(rdev); 2338 } else { 2339 return -EINVAL; 2340 } 2341 2342 if (ret < 0) 2343 return ret; 2344 return ret - rdev->constraints->uV_offset; 2345} 2346 2347/** 2348 * regulator_get_voltage - get regulator output voltage 2349 * @regulator: regulator source 2350 * 2351 * This returns the current regulator voltage in uV. 2352 * 2353 * NOTE: If the regulator is disabled it will return the voltage value. This 2354 * function should not be used to determine regulator state. 2355 */ 2356int regulator_get_voltage(struct regulator *regulator) 2357{ 2358 int ret; 2359 2360 mutex_lock(®ulator->rdev->mutex); 2361 2362 ret = _regulator_get_voltage(regulator->rdev); 2363 2364 mutex_unlock(®ulator->rdev->mutex); 2365 2366 return ret; 2367} 2368EXPORT_SYMBOL_GPL(regulator_get_voltage); 2369 2370/** 2371 * regulator_set_current_limit - set regulator output current limit 2372 * @regulator: regulator source 2373 * @min_uA: Minimuum supported current in uA 2374 * @max_uA: Maximum supported current in uA 2375 * 2376 * Sets current sink to the desired output current. This can be set during 2377 * any regulator state. IOW, regulator can be disabled or enabled. 2378 * 2379 * If the regulator is enabled then the current will change to the new value 2380 * immediately otherwise if the regulator is disabled the regulator will 2381 * output at the new current when enabled. 2382 * 2383 * NOTE: Regulator system constraints must be set for this regulator before 2384 * calling this function otherwise this call will fail. 2385 */ 2386int regulator_set_current_limit(struct regulator *regulator, 2387 int min_uA, int max_uA) 2388{ 2389 struct regulator_dev *rdev = regulator->rdev; 2390 int ret; 2391 2392 mutex_lock(&rdev->mutex); 2393 2394 /* sanity check */ 2395 if (!rdev->desc->ops->set_current_limit) { 2396 ret = -EINVAL; 2397 goto out; 2398 } 2399 2400 /* constraints check */ 2401 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2402 if (ret < 0) 2403 goto out; 2404 2405 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2406out: 2407 mutex_unlock(&rdev->mutex); 2408 return ret; 2409} 2410EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2411 2412static int _regulator_get_current_limit(struct regulator_dev *rdev) 2413{ 2414 int ret; 2415 2416 mutex_lock(&rdev->mutex); 2417 2418 /* sanity check */ 2419 if (!rdev->desc->ops->get_current_limit) { 2420 ret = -EINVAL; 2421 goto out; 2422 } 2423 2424 ret = rdev->desc->ops->get_current_limit(rdev); 2425out: 2426 mutex_unlock(&rdev->mutex); 2427 return ret; 2428} 2429 2430/** 2431 * regulator_get_current_limit - get regulator output current 2432 * @regulator: regulator source 2433 * 2434 * This returns the current supplied by the specified current sink in uA. 2435 * 2436 * NOTE: If the regulator is disabled it will return the current value. This 2437 * function should not be used to determine regulator state. 2438 */ 2439int regulator_get_current_limit(struct regulator *regulator) 2440{ 2441 return _regulator_get_current_limit(regulator->rdev); 2442} 2443EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2444 2445/** 2446 * regulator_set_mode - set regulator operating mode 2447 * @regulator: regulator source 2448 * @mode: operating mode - one of the REGULATOR_MODE constants 2449 * 2450 * Set regulator operating mode to increase regulator efficiency or improve 2451 * regulation performance. 2452 * 2453 * NOTE: Regulator system constraints must be set for this regulator before 2454 * calling this function otherwise this call will fail. 2455 */ 2456int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2457{ 2458 struct regulator_dev *rdev = regulator->rdev; 2459 int ret; 2460 int regulator_curr_mode; 2461 2462 mutex_lock(&rdev->mutex); 2463 2464 /* sanity check */ 2465 if (!rdev->desc->ops->set_mode) { 2466 ret = -EINVAL; 2467 goto out; 2468 } 2469 2470 /* return if the same mode is requested */ 2471 if (rdev->desc->ops->get_mode) { 2472 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2473 if (regulator_curr_mode == mode) { 2474 ret = 0; 2475 goto out; 2476 } 2477 } 2478 2479 /* constraints check */ 2480 ret = regulator_mode_constrain(rdev, &mode); 2481 if (ret < 0) 2482 goto out; 2483 2484 ret = rdev->desc->ops->set_mode(rdev, mode); 2485out: 2486 mutex_unlock(&rdev->mutex); 2487 return ret; 2488} 2489EXPORT_SYMBOL_GPL(regulator_set_mode); 2490 2491static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2492{ 2493 int ret; 2494 2495 mutex_lock(&rdev->mutex); 2496 2497 /* sanity check */ 2498 if (!rdev->desc->ops->get_mode) { 2499 ret = -EINVAL; 2500 goto out; 2501 } 2502 2503 ret = rdev->desc->ops->get_mode(rdev); 2504out: 2505 mutex_unlock(&rdev->mutex); 2506 return ret; 2507} 2508 2509/** 2510 * regulator_get_mode - get regulator operating mode 2511 * @regulator: regulator source 2512 * 2513 * Get the current regulator operating mode. 2514 */ 2515unsigned int regulator_get_mode(struct regulator *regulator) 2516{ 2517 return _regulator_get_mode(regulator->rdev); 2518} 2519EXPORT_SYMBOL_GPL(regulator_get_mode); 2520 2521/** 2522 * regulator_set_optimum_mode - set regulator optimum operating mode 2523 * @regulator: regulator source 2524 * @uA_load: load current 2525 * 2526 * Notifies the regulator core of a new device load. This is then used by 2527 * DRMS (if enabled by constraints) to set the most efficient regulator 2528 * operating mode for the new regulator loading. 2529 * 2530 * Consumer devices notify their supply regulator of the maximum power 2531 * they will require (can be taken from device datasheet in the power 2532 * consumption tables) when they change operational status and hence power 2533 * state. Examples of operational state changes that can affect power 2534 * consumption are :- 2535 * 2536 * o Device is opened / closed. 2537 * o Device I/O is about to begin or has just finished. 2538 * o Device is idling in between work. 2539 * 2540 * This information is also exported via sysfs to userspace. 2541 * 2542 * DRMS will sum the total requested load on the regulator and change 2543 * to the most efficient operating mode if platform constraints allow. 2544 * 2545 * Returns the new regulator mode or error. 2546 */ 2547int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2548{ 2549 struct regulator_dev *rdev = regulator->rdev; 2550 struct regulator *consumer; 2551 int ret, output_uV, input_uV, total_uA_load = 0; 2552 unsigned int mode; 2553 2554 mutex_lock(&rdev->mutex); 2555 2556 /* 2557 * first check to see if we can set modes at all, otherwise just 2558 * tell the consumer everything is OK. 2559 */ 2560 regulator->uA_load = uA_load; 2561 ret = regulator_check_drms(rdev); 2562 if (ret < 0) { 2563 ret = 0; 2564 goto out; 2565 } 2566 2567 if (!rdev->desc->ops->get_optimum_mode) 2568 goto out; 2569 2570 /* 2571 * we can actually do this so any errors are indicators of 2572 * potential real failure. 2573 */ 2574 ret = -EINVAL; 2575 2576 if (!rdev->desc->ops->set_mode) 2577 goto out; 2578 2579 /* get output voltage */ 2580 output_uV = _regulator_get_voltage(rdev); 2581 if (output_uV <= 0) { 2582 rdev_err(rdev, "invalid output voltage found\n"); 2583 goto out; 2584 } 2585 2586 /* get input voltage */ 2587 input_uV = 0; 2588 if (rdev->supply) 2589 input_uV = regulator_get_voltage(rdev->supply); 2590 if (input_uV <= 0) 2591 input_uV = rdev->constraints->input_uV; 2592 if (input_uV <= 0) { 2593 rdev_err(rdev, "invalid input voltage found\n"); 2594 goto out; 2595 } 2596 2597 /* calc total requested load for this regulator */ 2598 list_for_each_entry(consumer, &rdev->consumer_list, list) 2599 total_uA_load += consumer->uA_load; 2600 2601 mode = rdev->desc->ops->get_optimum_mode(rdev, 2602 input_uV, output_uV, 2603 total_uA_load); 2604 ret = regulator_mode_constrain(rdev, &mode); 2605 if (ret < 0) { 2606 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2607 total_uA_load, input_uV, output_uV); 2608 goto out; 2609 } 2610 2611 ret = rdev->desc->ops->set_mode(rdev, mode); 2612 if (ret < 0) { 2613 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2614 goto out; 2615 } 2616 ret = mode; 2617out: 2618 mutex_unlock(&rdev->mutex); 2619 return ret; 2620} 2621EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2622 2623/** 2624 * regulator_register_notifier - register regulator event notifier 2625 * @regulator: regulator source 2626 * @nb: notifier block 2627 * 2628 * Register notifier block to receive regulator events. 2629 */ 2630int regulator_register_notifier(struct regulator *regulator, 2631 struct notifier_block *nb) 2632{ 2633 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2634 nb); 2635} 2636EXPORT_SYMBOL_GPL(regulator_register_notifier); 2637 2638/** 2639 * regulator_unregister_notifier - unregister regulator event notifier 2640 * @regulator: regulator source 2641 * @nb: notifier block 2642 * 2643 * Unregister regulator event notifier block. 2644 */ 2645int regulator_unregister_notifier(struct regulator *regulator, 2646 struct notifier_block *nb) 2647{ 2648 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2649 nb); 2650} 2651EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2652 2653/* notify regulator consumers and downstream regulator consumers. 2654 * Note mutex must be held by caller. 2655 */ 2656static void _notifier_call_chain(struct regulator_dev *rdev, 2657 unsigned long event, void *data) 2658{ 2659 /* call rdev chain first */ 2660 blocking_notifier_call_chain(&rdev->notifier, event, data); 2661} 2662 2663/** 2664 * regulator_bulk_get - get multiple regulator consumers 2665 * 2666 * @dev: Device to supply 2667 * @num_consumers: Number of consumers to register 2668 * @consumers: Configuration of consumers; clients are stored here. 2669 * 2670 * @return 0 on success, an errno on failure. 2671 * 2672 * This helper function allows drivers to get several regulator 2673 * consumers in one operation. If any of the regulators cannot be 2674 * acquired then any regulators that were allocated will be freed 2675 * before returning to the caller. 2676 */ 2677int regulator_bulk_get(struct device *dev, int num_consumers, 2678 struct regulator_bulk_data *consumers) 2679{ 2680 int i; 2681 int ret; 2682 2683 for (i = 0; i < num_consumers; i++) 2684 consumers[i].consumer = NULL; 2685 2686 for (i = 0; i < num_consumers; i++) { 2687 consumers[i].consumer = regulator_get(dev, 2688 consumers[i].supply); 2689 if (IS_ERR(consumers[i].consumer)) { 2690 ret = PTR_ERR(consumers[i].consumer); 2691 dev_err(dev, "Failed to get supply '%s': %d\n", 2692 consumers[i].supply, ret); 2693 consumers[i].consumer = NULL; 2694 goto err; 2695 } 2696 } 2697 2698 return 0; 2699 2700err: 2701 while (--i >= 0) 2702 regulator_put(consumers[i].consumer); 2703 2704 return ret; 2705} 2706EXPORT_SYMBOL_GPL(regulator_bulk_get); 2707 2708/** 2709 * devm_regulator_bulk_get - managed get multiple regulator consumers 2710 * 2711 * @dev: Device to supply 2712 * @num_consumers: Number of consumers to register 2713 * @consumers: Configuration of consumers; clients are stored here. 2714 * 2715 * @return 0 on success, an errno on failure. 2716 * 2717 * This helper function allows drivers to get several regulator 2718 * consumers in one operation with management, the regulators will 2719 * automatically be freed when the device is unbound. If any of the 2720 * regulators cannot be acquired then any regulators that were 2721 * allocated will be freed before returning to the caller. 2722 */ 2723int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2724 struct regulator_bulk_data *consumers) 2725{ 2726 int i; 2727 int ret; 2728 2729 for (i = 0; i < num_consumers; i++) 2730 consumers[i].consumer = NULL; 2731 2732 for (i = 0; i < num_consumers; i++) { 2733 consumers[i].consumer = devm_regulator_get(dev, 2734 consumers[i].supply); 2735 if (IS_ERR(consumers[i].consumer)) { 2736 ret = PTR_ERR(consumers[i].consumer); 2737 dev_err(dev, "Failed to get supply '%s': %d\n", 2738 consumers[i].supply, ret); 2739 consumers[i].consumer = NULL; 2740 goto err; 2741 } 2742 } 2743 2744 return 0; 2745 2746err: 2747 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2748 devm_regulator_put(consumers[i].consumer); 2749 2750 return ret; 2751} 2752EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2753 2754static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2755{ 2756 struct regulator_bulk_data *bulk = data; 2757 2758 bulk->ret = regulator_enable(bulk->consumer); 2759} 2760 2761/** 2762 * regulator_bulk_enable - enable multiple regulator consumers 2763 * 2764 * @num_consumers: Number of consumers 2765 * @consumers: Consumer data; clients are stored here. 2766 * @return 0 on success, an errno on failure 2767 * 2768 * This convenience API allows consumers to enable multiple regulator 2769 * clients in a single API call. If any consumers cannot be enabled 2770 * then any others that were enabled will be disabled again prior to 2771 * return. 2772 */ 2773int regulator_bulk_enable(int num_consumers, 2774 struct regulator_bulk_data *consumers) 2775{ 2776 LIST_HEAD(async_domain); 2777 int i; 2778 int ret = 0; 2779 2780 for (i = 0; i < num_consumers; i++) { 2781 if (consumers[i].consumer->always_on) 2782 consumers[i].ret = 0; 2783 else 2784 async_schedule_domain(regulator_bulk_enable_async, 2785 &consumers[i], &async_domain); 2786 } 2787 2788 async_synchronize_full_domain(&async_domain); 2789 2790 /* If any consumer failed we need to unwind any that succeeded */ 2791 for (i = 0; i < num_consumers; i++) { 2792 if (consumers[i].ret != 0) { 2793 ret = consumers[i].ret; 2794 goto err; 2795 } 2796 } 2797 2798 return 0; 2799 2800err: 2801 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 2802 while (--i >= 0) 2803 regulator_disable(consumers[i].consumer); 2804 2805 return ret; 2806} 2807EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2808 2809/** 2810 * regulator_bulk_disable - disable multiple regulator consumers 2811 * 2812 * @num_consumers: Number of consumers 2813 * @consumers: Consumer data; clients are stored here. 2814 * @return 0 on success, an errno on failure 2815 * 2816 * This convenience API allows consumers to disable multiple regulator 2817 * clients in a single API call. If any consumers cannot be disabled 2818 * then any others that were disabled will be enabled again prior to 2819 * return. 2820 */ 2821int regulator_bulk_disable(int num_consumers, 2822 struct regulator_bulk_data *consumers) 2823{ 2824 int i; 2825 int ret, r; 2826 2827 for (i = num_consumers - 1; i >= 0; --i) { 2828 ret = regulator_disable(consumers[i].consumer); 2829 if (ret != 0) 2830 goto err; 2831 } 2832 2833 return 0; 2834 2835err: 2836 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2837 for (++i; i < num_consumers; ++i) { 2838 r = regulator_enable(consumers[i].consumer); 2839 if (r != 0) 2840 pr_err("Failed to reename %s: %d\n", 2841 consumers[i].supply, r); 2842 } 2843 2844 return ret; 2845} 2846EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2847 2848/** 2849 * regulator_bulk_force_disable - force disable multiple regulator consumers 2850 * 2851 * @num_consumers: Number of consumers 2852 * @consumers: Consumer data; clients are stored here. 2853 * @return 0 on success, an errno on failure 2854 * 2855 * This convenience API allows consumers to forcibly disable multiple regulator 2856 * clients in a single API call. 2857 * NOTE: This should be used for situations when device damage will 2858 * likely occur if the regulators are not disabled (e.g. over temp). 2859 * Although regulator_force_disable function call for some consumers can 2860 * return error numbers, the function is called for all consumers. 2861 */ 2862int regulator_bulk_force_disable(int num_consumers, 2863 struct regulator_bulk_data *consumers) 2864{ 2865 int i; 2866 int ret; 2867 2868 for (i = 0; i < num_consumers; i++) 2869 consumers[i].ret = 2870 regulator_force_disable(consumers[i].consumer); 2871 2872 for (i = 0; i < num_consumers; i++) { 2873 if (consumers[i].ret != 0) { 2874 ret = consumers[i].ret; 2875 goto out; 2876 } 2877 } 2878 2879 return 0; 2880out: 2881 return ret; 2882} 2883EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 2884 2885/** 2886 * regulator_bulk_free - free multiple regulator consumers 2887 * 2888 * @num_consumers: Number of consumers 2889 * @consumers: Consumer data; clients are stored here. 2890 * 2891 * This convenience API allows consumers to free multiple regulator 2892 * clients in a single API call. 2893 */ 2894void regulator_bulk_free(int num_consumers, 2895 struct regulator_bulk_data *consumers) 2896{ 2897 int i; 2898 2899 for (i = 0; i < num_consumers; i++) { 2900 regulator_put(consumers[i].consumer); 2901 consumers[i].consumer = NULL; 2902 } 2903} 2904EXPORT_SYMBOL_GPL(regulator_bulk_free); 2905 2906/** 2907 * regulator_notifier_call_chain - call regulator event notifier 2908 * @rdev: regulator source 2909 * @event: notifier block 2910 * @data: callback-specific data. 2911 * 2912 * Called by regulator drivers to notify clients a regulator event has 2913 * occurred. We also notify regulator clients downstream. 2914 * Note lock must be held by caller. 2915 */ 2916int regulator_notifier_call_chain(struct regulator_dev *rdev, 2917 unsigned long event, void *data) 2918{ 2919 _notifier_call_chain(rdev, event, data); 2920 return NOTIFY_DONE; 2921 2922} 2923EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2924 2925/** 2926 * regulator_mode_to_status - convert a regulator mode into a status 2927 * 2928 * @mode: Mode to convert 2929 * 2930 * Convert a regulator mode into a status. 2931 */ 2932int regulator_mode_to_status(unsigned int mode) 2933{ 2934 switch (mode) { 2935 case REGULATOR_MODE_FAST: 2936 return REGULATOR_STATUS_FAST; 2937 case REGULATOR_MODE_NORMAL: 2938 return REGULATOR_STATUS_NORMAL; 2939 case REGULATOR_MODE_IDLE: 2940 return REGULATOR_STATUS_IDLE; 2941 case REGULATOR_STATUS_STANDBY: 2942 return REGULATOR_STATUS_STANDBY; 2943 default: 2944 return 0; 2945 } 2946} 2947EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2948 2949/* 2950 * To avoid cluttering sysfs (and memory) with useless state, only 2951 * create attributes that can be meaningfully displayed. 2952 */ 2953static int add_regulator_attributes(struct regulator_dev *rdev) 2954{ 2955 struct device *dev = &rdev->dev; 2956 struct regulator_ops *ops = rdev->desc->ops; 2957 int status = 0; 2958 2959 /* some attributes need specific methods to be displayed */ 2960 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 2961 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 2962 status = device_create_file(dev, &dev_attr_microvolts); 2963 if (status < 0) 2964 return status; 2965 } 2966 if (ops->get_current_limit) { 2967 status = device_create_file(dev, &dev_attr_microamps); 2968 if (status < 0) 2969 return status; 2970 } 2971 if (ops->get_mode) { 2972 status = device_create_file(dev, &dev_attr_opmode); 2973 if (status < 0) 2974 return status; 2975 } 2976 if (ops->is_enabled) { 2977 status = device_create_file(dev, &dev_attr_state); 2978 if (status < 0) 2979 return status; 2980 } 2981 if (ops->get_status) { 2982 status = device_create_file(dev, &dev_attr_status); 2983 if (status < 0) 2984 return status; 2985 } 2986 2987 /* some attributes are type-specific */ 2988 if (rdev->desc->type == REGULATOR_CURRENT) { 2989 status = device_create_file(dev, &dev_attr_requested_microamps); 2990 if (status < 0) 2991 return status; 2992 } 2993 2994 /* all the other attributes exist to support constraints; 2995 * don't show them if there are no constraints, or if the 2996 * relevant supporting methods are missing. 2997 */ 2998 if (!rdev->constraints) 2999 return status; 3000 3001 /* constraints need specific supporting methods */ 3002 if (ops->set_voltage || ops->set_voltage_sel) { 3003 status = device_create_file(dev, &dev_attr_min_microvolts); 3004 if (status < 0) 3005 return status; 3006 status = device_create_file(dev, &dev_attr_max_microvolts); 3007 if (status < 0) 3008 return status; 3009 } 3010 if (ops->set_current_limit) { 3011 status = device_create_file(dev, &dev_attr_min_microamps); 3012 if (status < 0) 3013 return status; 3014 status = device_create_file(dev, &dev_attr_max_microamps); 3015 if (status < 0) 3016 return status; 3017 } 3018 3019 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3020 if (status < 0) 3021 return status; 3022 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3023 if (status < 0) 3024 return status; 3025 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3026 if (status < 0) 3027 return status; 3028 3029 if (ops->set_suspend_voltage) { 3030 status = device_create_file(dev, 3031 &dev_attr_suspend_standby_microvolts); 3032 if (status < 0) 3033 return status; 3034 status = device_create_file(dev, 3035 &dev_attr_suspend_mem_microvolts); 3036 if (status < 0) 3037 return status; 3038 status = device_create_file(dev, 3039 &dev_attr_suspend_disk_microvolts); 3040 if (status < 0) 3041 return status; 3042 } 3043 3044 if (ops->set_suspend_mode) { 3045 status = device_create_file(dev, 3046 &dev_attr_suspend_standby_mode); 3047 if (status < 0) 3048 return status; 3049 status = device_create_file(dev, 3050 &dev_attr_suspend_mem_mode); 3051 if (status < 0) 3052 return status; 3053 status = device_create_file(dev, 3054 &dev_attr_suspend_disk_mode); 3055 if (status < 0) 3056 return status; 3057 } 3058 3059 return status; 3060} 3061 3062static void rdev_init_debugfs(struct regulator_dev *rdev) 3063{ 3064 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3065 if (!rdev->debugfs) { 3066 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3067 return; 3068 } 3069 3070 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3071 &rdev->use_count); 3072 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3073 &rdev->open_count); 3074} 3075 3076/** 3077 * regulator_register - register regulator 3078 * @regulator_desc: regulator to register 3079 * @config: runtime configuration for regulator 3080 * 3081 * Called by regulator drivers to register a regulator. 3082 * Returns 0 on success. 3083 */ 3084struct regulator_dev * 3085regulator_register(const struct regulator_desc *regulator_desc, 3086 const struct regulator_config *config) 3087{ 3088 const struct regulation_constraints *constraints = NULL; 3089 const struct regulator_init_data *init_data; 3090 static atomic_t regulator_no = ATOMIC_INIT(0); 3091 struct regulator_dev *rdev; 3092 struct device *dev; 3093 int ret, i; 3094 const char *supply = NULL; 3095 3096 if (regulator_desc == NULL || config == NULL) 3097 return ERR_PTR(-EINVAL); 3098 3099 dev = config->dev; 3100 WARN_ON(!dev); 3101 3102 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3103 return ERR_PTR(-EINVAL); 3104 3105 if (regulator_desc->type != REGULATOR_VOLTAGE && 3106 regulator_desc->type != REGULATOR_CURRENT) 3107 return ERR_PTR(-EINVAL); 3108 3109 /* Only one of each should be implemented */ 3110 WARN_ON(regulator_desc->ops->get_voltage && 3111 regulator_desc->ops->get_voltage_sel); 3112 WARN_ON(regulator_desc->ops->set_voltage && 3113 regulator_desc->ops->set_voltage_sel); 3114 3115 /* If we're using selectors we must implement list_voltage. */ 3116 if (regulator_desc->ops->get_voltage_sel && 3117 !regulator_desc->ops->list_voltage) { 3118 return ERR_PTR(-EINVAL); 3119 } 3120 if (regulator_desc->ops->set_voltage_sel && 3121 !regulator_desc->ops->list_voltage) { 3122 return ERR_PTR(-EINVAL); 3123 } 3124 3125 init_data = config->init_data; 3126 3127 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3128 if (rdev == NULL) 3129 return ERR_PTR(-ENOMEM); 3130 3131 mutex_lock(®ulator_list_mutex); 3132 3133 mutex_init(&rdev->mutex); 3134 rdev->reg_data = config->driver_data; 3135 rdev->owner = regulator_desc->owner; 3136 rdev->desc = regulator_desc; 3137 if (config->regmap) 3138 rdev->regmap = config->regmap; 3139 else 3140 rdev->regmap = dev_get_regmap(dev, NULL); 3141 INIT_LIST_HEAD(&rdev->consumer_list); 3142 INIT_LIST_HEAD(&rdev->list); 3143 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3144 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3145 3146 /* preform any regulator specific init */ 3147 if (init_data && init_data->regulator_init) { 3148 ret = init_data->regulator_init(rdev->reg_data); 3149 if (ret < 0) 3150 goto clean; 3151 } 3152 3153 /* register with sysfs */ 3154 rdev->dev.class = ®ulator_class; 3155 rdev->dev.of_node = config->of_node; 3156 rdev->dev.parent = dev; 3157 dev_set_name(&rdev->dev, "regulator.%d", 3158 atomic_inc_return(®ulator_no) - 1); 3159 ret = device_register(&rdev->dev); 3160 if (ret != 0) { 3161 put_device(&rdev->dev); 3162 goto clean; 3163 } 3164 3165 dev_set_drvdata(&rdev->dev, rdev); 3166 3167 /* set regulator constraints */ 3168 if (init_data) 3169 constraints = &init_data->constraints; 3170 3171 ret = set_machine_constraints(rdev, constraints); 3172 if (ret < 0) 3173 goto scrub; 3174 3175 /* add attributes supported by this regulator */ 3176 ret = add_regulator_attributes(rdev); 3177 if (ret < 0) 3178 goto scrub; 3179 3180 if (init_data && init_data->supply_regulator) 3181 supply = init_data->supply_regulator; 3182 else if (regulator_desc->supply_name) 3183 supply = regulator_desc->supply_name; 3184 3185 if (supply) { 3186 struct regulator_dev *r; 3187 3188 r = regulator_dev_lookup(dev, supply, &ret); 3189 3190 if (!r) { 3191 dev_err(dev, "Failed to find supply %s\n", supply); 3192 ret = -EPROBE_DEFER; 3193 goto scrub; 3194 } 3195 3196 ret = set_supply(rdev, r); 3197 if (ret < 0) 3198 goto scrub; 3199 3200 /* Enable supply if rail is enabled */ 3201 if (_regulator_is_enabled(rdev)) { 3202 ret = regulator_enable(rdev->supply); 3203 if (ret < 0) 3204 goto scrub; 3205 } 3206 } 3207 3208 /* add consumers devices */ 3209 if (init_data) { 3210 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3211 ret = set_consumer_device_supply(rdev, 3212 init_data->consumer_supplies[i].dev_name, 3213 init_data->consumer_supplies[i].supply); 3214 if (ret < 0) { 3215 dev_err(dev, "Failed to set supply %s\n", 3216 init_data->consumer_supplies[i].supply); 3217 goto unset_supplies; 3218 } 3219 } 3220 } 3221 3222 list_add(&rdev->list, ®ulator_list); 3223 3224 rdev_init_debugfs(rdev); 3225out: 3226 mutex_unlock(®ulator_list_mutex); 3227 return rdev; 3228 3229unset_supplies: 3230 unset_regulator_supplies(rdev); 3231 3232scrub: 3233 if (rdev->supply) 3234 regulator_put(rdev->supply); 3235 kfree(rdev->constraints); 3236 device_unregister(&rdev->dev); 3237 /* device core frees rdev */ 3238 rdev = ERR_PTR(ret); 3239 goto out; 3240 3241clean: 3242 kfree(rdev); 3243 rdev = ERR_PTR(ret); 3244 goto out; 3245} 3246EXPORT_SYMBOL_GPL(regulator_register); 3247 3248/** 3249 * regulator_unregister - unregister regulator 3250 * @rdev: regulator to unregister 3251 * 3252 * Called by regulator drivers to unregister a regulator. 3253 */ 3254void regulator_unregister(struct regulator_dev *rdev) 3255{ 3256 if (rdev == NULL) 3257 return; 3258 3259 if (rdev->supply) 3260 regulator_put(rdev->supply); 3261 mutex_lock(®ulator_list_mutex); 3262 debugfs_remove_recursive(rdev->debugfs); 3263 flush_work_sync(&rdev->disable_work.work); 3264 WARN_ON(rdev->open_count); 3265 unset_regulator_supplies(rdev); 3266 list_del(&rdev->list); 3267 kfree(rdev->constraints); 3268 device_unregister(&rdev->dev); 3269 mutex_unlock(®ulator_list_mutex); 3270} 3271EXPORT_SYMBOL_GPL(regulator_unregister); 3272 3273/** 3274 * regulator_suspend_prepare - prepare regulators for system wide suspend 3275 * @state: system suspend state 3276 * 3277 * Configure each regulator with it's suspend operating parameters for state. 3278 * This will usually be called by machine suspend code prior to supending. 3279 */ 3280int regulator_suspend_prepare(suspend_state_t state) 3281{ 3282 struct regulator_dev *rdev; 3283 int ret = 0; 3284 3285 /* ON is handled by regulator active state */ 3286 if (state == PM_SUSPEND_ON) 3287 return -EINVAL; 3288 3289 mutex_lock(®ulator_list_mutex); 3290 list_for_each_entry(rdev, ®ulator_list, list) { 3291 3292 mutex_lock(&rdev->mutex); 3293 ret = suspend_prepare(rdev, state); 3294 mutex_unlock(&rdev->mutex); 3295 3296 if (ret < 0) { 3297 rdev_err(rdev, "failed to prepare\n"); 3298 goto out; 3299 } 3300 } 3301out: 3302 mutex_unlock(®ulator_list_mutex); 3303 return ret; 3304} 3305EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3306 3307/** 3308 * regulator_suspend_finish - resume regulators from system wide suspend 3309 * 3310 * Turn on regulators that might be turned off by regulator_suspend_prepare 3311 * and that should be turned on according to the regulators properties. 3312 */ 3313int regulator_suspend_finish(void) 3314{ 3315 struct regulator_dev *rdev; 3316 int ret = 0, error; 3317 3318 mutex_lock(®ulator_list_mutex); 3319 list_for_each_entry(rdev, ®ulator_list, list) { 3320 struct regulator_ops *ops = rdev->desc->ops; 3321 3322 mutex_lock(&rdev->mutex); 3323 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3324 ops->enable) { 3325 error = ops->enable(rdev); 3326 if (error) 3327 ret = error; 3328 } else { 3329 if (!has_full_constraints) 3330 goto unlock; 3331 if (!ops->disable) 3332 goto unlock; 3333 if (!_regulator_is_enabled(rdev)) 3334 goto unlock; 3335 3336 error = ops->disable(rdev); 3337 if (error) 3338 ret = error; 3339 } 3340unlock: 3341 mutex_unlock(&rdev->mutex); 3342 } 3343 mutex_unlock(®ulator_list_mutex); 3344 return ret; 3345} 3346EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3347 3348/** 3349 * regulator_has_full_constraints - the system has fully specified constraints 3350 * 3351 * Calling this function will cause the regulator API to disable all 3352 * regulators which have a zero use count and don't have an always_on 3353 * constraint in a late_initcall. 3354 * 3355 * The intention is that this will become the default behaviour in a 3356 * future kernel release so users are encouraged to use this facility 3357 * now. 3358 */ 3359void regulator_has_full_constraints(void) 3360{ 3361 has_full_constraints = 1; 3362} 3363EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3364 3365/** 3366 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3367 * 3368 * Calling this function will cause the regulator API to provide a 3369 * dummy regulator to consumers if no physical regulator is found, 3370 * allowing most consumers to proceed as though a regulator were 3371 * configured. This allows systems such as those with software 3372 * controllable regulators for the CPU core only to be brought up more 3373 * readily. 3374 */ 3375void regulator_use_dummy_regulator(void) 3376{ 3377 board_wants_dummy_regulator = true; 3378} 3379EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3380 3381/** 3382 * rdev_get_drvdata - get rdev regulator driver data 3383 * @rdev: regulator 3384 * 3385 * Get rdev regulator driver private data. This call can be used in the 3386 * regulator driver context. 3387 */ 3388void *rdev_get_drvdata(struct regulator_dev *rdev) 3389{ 3390 return rdev->reg_data; 3391} 3392EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3393 3394/** 3395 * regulator_get_drvdata - get regulator driver data 3396 * @regulator: regulator 3397 * 3398 * Get regulator driver private data. This call can be used in the consumer 3399 * driver context when non API regulator specific functions need to be called. 3400 */ 3401void *regulator_get_drvdata(struct regulator *regulator) 3402{ 3403 return regulator->rdev->reg_data; 3404} 3405EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3406 3407/** 3408 * regulator_set_drvdata - set regulator driver data 3409 * @regulator: regulator 3410 * @data: data 3411 */ 3412void regulator_set_drvdata(struct regulator *regulator, void *data) 3413{ 3414 regulator->rdev->reg_data = data; 3415} 3416EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3417 3418/** 3419 * regulator_get_id - get regulator ID 3420 * @rdev: regulator 3421 */ 3422int rdev_get_id(struct regulator_dev *rdev) 3423{ 3424 return rdev->desc->id; 3425} 3426EXPORT_SYMBOL_GPL(rdev_get_id); 3427 3428struct device *rdev_get_dev(struct regulator_dev *rdev) 3429{ 3430 return &rdev->dev; 3431} 3432EXPORT_SYMBOL_GPL(rdev_get_dev); 3433 3434void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3435{ 3436 return reg_init_data->driver_data; 3437} 3438EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3439 3440#ifdef CONFIG_DEBUG_FS 3441static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3442 size_t count, loff_t *ppos) 3443{ 3444 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3445 ssize_t len, ret = 0; 3446 struct regulator_map *map; 3447 3448 if (!buf) 3449 return -ENOMEM; 3450 3451 list_for_each_entry(map, ®ulator_map_list, list) { 3452 len = snprintf(buf + ret, PAGE_SIZE - ret, 3453 "%s -> %s.%s\n", 3454 rdev_get_name(map->regulator), map->dev_name, 3455 map->supply); 3456 if (len >= 0) 3457 ret += len; 3458 if (ret > PAGE_SIZE) { 3459 ret = PAGE_SIZE; 3460 break; 3461 } 3462 } 3463 3464 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3465 3466 kfree(buf); 3467 3468 return ret; 3469} 3470#endif 3471 3472static const struct file_operations supply_map_fops = { 3473#ifdef CONFIG_DEBUG_FS 3474 .read = supply_map_read_file, 3475 .llseek = default_llseek, 3476#endif 3477}; 3478 3479static int __init regulator_init(void) 3480{ 3481 int ret; 3482 3483 ret = class_register(®ulator_class); 3484 3485 debugfs_root = debugfs_create_dir("regulator", NULL); 3486 if (!debugfs_root) 3487 pr_warn("regulator: Failed to create debugfs directory\n"); 3488 3489 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3490 &supply_map_fops); 3491 3492 regulator_dummy_init(); 3493 3494 return ret; 3495} 3496 3497/* init early to allow our consumers to complete system booting */ 3498core_initcall(regulator_init); 3499 3500static int __init regulator_init_complete(void) 3501{ 3502 struct regulator_dev *rdev; 3503 struct regulator_ops *ops; 3504 struct regulation_constraints *c; 3505 int enabled, ret; 3506 3507 mutex_lock(®ulator_list_mutex); 3508 3509 /* If we have a full configuration then disable any regulators 3510 * which are not in use or always_on. This will become the 3511 * default behaviour in the future. 3512 */ 3513 list_for_each_entry(rdev, ®ulator_list, list) { 3514 ops = rdev->desc->ops; 3515 c = rdev->constraints; 3516 3517 if (!ops->disable || (c && c->always_on)) 3518 continue; 3519 3520 mutex_lock(&rdev->mutex); 3521 3522 if (rdev->use_count) 3523 goto unlock; 3524 3525 /* If we can't read the status assume it's on. */ 3526 if (ops->is_enabled) 3527 enabled = ops->is_enabled(rdev); 3528 else 3529 enabled = 1; 3530 3531 if (!enabled) 3532 goto unlock; 3533 3534 if (has_full_constraints) { 3535 /* We log since this may kill the system if it 3536 * goes wrong. */ 3537 rdev_info(rdev, "disabling\n"); 3538 ret = ops->disable(rdev); 3539 if (ret != 0) { 3540 rdev_err(rdev, "couldn't disable: %d\n", ret); 3541 } 3542 } else { 3543 /* The intention is that in future we will 3544 * assume that full constraints are provided 3545 * so warn even if we aren't going to do 3546 * anything here. 3547 */ 3548 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3549 } 3550 3551unlock: 3552 mutex_unlock(&rdev->mutex); 3553 } 3554 3555 mutex_unlock(®ulator_list_mutex); 3556 3557 return 0; 3558} 3559late_initcall(regulator_init_complete); 3560